diff --git a/rsconcept/frontend/src/components/Icons.tsx b/rsconcept/frontend/src/components/Icons.tsx
index eb41fa14..7a247f00 100644
--- a/rsconcept/frontend/src/components/Icons.tsx
+++ b/rsconcept/frontend/src/components/Icons.tsx
@@ -83,7 +83,6 @@ export { LuNewspaper      as IconDefinition }     from 'react-icons/lu';
 export { LuDna            as IconTerminology }    from 'react-icons/lu';
 export { FaRegHandshake   as IconConvention }     from 'react-icons/fa6';
 export { LiaCloneSolid    as IconChild }          from 'react-icons/lia';
-export { RiParentLine     as IconParent }         from 'react-icons/ri';
 export { TbTopologyRing   as IconConsolidation }  from 'react-icons/tb';
 export { BiSpa            as IconPredecessor }    from 'react-icons/bi';
 export { LuArchive        as IconArchive }        from 'react-icons/lu';
diff --git a/rsconcept/frontend/src/components/select/PickSubstitutions.tsx b/rsconcept/frontend/src/components/select/PickSubstitutions.tsx
index f802febe..627e81aa 100644
--- a/rsconcept/frontend/src/components/select/PickSubstitutions.tsx
+++ b/rsconcept/frontend/src/components/select/PickSubstitutions.tsx
@@ -5,7 +5,7 @@ import { toast } from 'react-toastify';
 
 import BadgeConstituenta from '@/components/info/BadgeConstituenta';
 import SelectConstituenta from '@/components/select/SelectConstituenta';
-import DataTable, { createColumnHelper } from '@/components/ui/DataTable';
+import DataTable, { createColumnHelper, IConditionalStyle } from '@/components/ui/DataTable';
 import MiniButton from '@/components/ui/MiniButton';
 import { useConceptOptions } from '@/context/ConceptOptionsContext';
 import { ILibraryItem } from '@/models/library';
@@ -13,13 +13,14 @@ import { ICstSubstitute, IMultiSubstitution } from '@/models/oss';
 import { ConstituentaID, IConstituenta, IRSForm } from '@/models/rsform';
 import { errors } from '@/utils/labels';
 
-import { IconPageLeft, IconPageRight, IconRemove, IconReplace } from '../Icons';
+import { IconAccept, IconPageLeft, IconPageRight, IconRemove, IconReplace } from '../Icons';
 import NoData from '../ui/NoData';
 import SelectLibraryItem from './SelectLibraryItem';
 
 interface PickSubstitutionsProps {
   substitutions: ICstSubstitute[];
   setSubstitutions: React.Dispatch<React.SetStateAction<ICstSubstitute[]>>;
+  suggestions?: ICstSubstitute[];
 
   prefixID: string;
   rows?: number;
@@ -34,6 +35,7 @@ const columnHelper = createColumnHelper<IMultiSubstitution>();
 function PickSubstitutions({
   substitutions,
   setSubstitutions,
+  suggestions,
   prefixID,
   rows,
   schemas,
@@ -55,6 +57,15 @@ function PickSubstitutions({
   const [deleteRight, setDeleteRight] = useState(true);
   const toggleDelete = () => setDeleteRight(prev => !prev);
 
+  const [ignores, setIgnores] = useState<ICstSubstitute[]>([]);
+  const filteredSuggestions = useMemo(
+    () =>
+      suggestions?.filter(
+        item => !ignores.find(ignore => ignore.original === item.original && ignore.substitution === item.substitution)
+      ) ?? [],
+    [ignores, suggestions]
+  );
+
   const getSchemaByCst = useCallback(
     (id: ConstituentaID): IRSForm | undefined => {
       for (const schema of schemas) {
@@ -82,14 +93,23 @@ function PickSubstitutions({
   );
 
   const substitutionData: IMultiSubstitution[] = useMemo(
-    () =>
-      substitutions.map(item => ({
+    () => [
+      ...substitutions.map(item => ({
         original_source: getSchemaByCst(item.original)!,
         original: getConstituenta(item.original)!,
         substitution: getConstituenta(item.substitution)!,
-        substitution_source: getSchemaByCst(item.substitution)!
+        substitution_source: getSchemaByCst(item.substitution)!,
+        is_suggestion: false
       })),
-    [getConstituenta, getSchemaByCst, substitutions]
+      ...filteredSuggestions.map(item => ({
+        original_source: getSchemaByCst(item.original)!,
+        original: getConstituenta(item.original)!,
+        substitution: getConstituenta(item.substitution)!,
+        substitution_source: getSchemaByCst(item.substitution)!,
+        is_suggestion: true
+      }))
+    ],
+    [getConstituenta, getSchemaByCst, substitutions, filteredSuggestions]
   );
 
   function addSubstitution() {
@@ -121,19 +141,34 @@ function PickSubstitutions({
     setRightCst(undefined);
   }
 
-  const handleDeleteRow = useCallback(
-    (row: number) => {
+  const handleDeclineSuggestion = useCallback(
+    (item: IMultiSubstitution) => {
+      setIgnores(prev => [...prev, { original: item.original.id, substitution: item.substitution.id }]);
+    },
+    [setIgnores]
+  );
+
+  const handleAcceptSuggestion = useCallback(
+    (item: IMultiSubstitution) => {
+      setSubstitutions(prev => [...prev, { original: item.original.id, substitution: item.substitution.id }]);
+    },
+    [setSubstitutions]
+  );
+
+  const handleDeleteSubstitution = useCallback(
+    (target: IMultiSubstitution) => {
+      handleDeclineSuggestion(target);
       setSubstitutions(prev => {
         const newItems: ICstSubstitute[] = [];
-        prev.forEach((item, index) => {
-          if (index !== row) {
+        prev.forEach(item => {
+          if (item.original !== target.original.id || item.substitution !== target.substitution.id) {
             newItems.push(item);
           }
         });
         return newItems;
       });
     },
-    [setSubstitutions]
+    [setSubstitutions, handleDeclineSuggestion]
   );
 
   const columns = useMemo(
@@ -169,19 +204,47 @@ function PickSubstitutions({
       }),
       columnHelper.display({
         id: 'actions',
-        cell: props => (
-          <div className='max-w-fit'>
-            <MiniButton
-              noHover
-              title='Удалить'
-              icon={<IconRemove size='1rem' className='icon-red' />}
-              onClick={() => handleDeleteRow(props.row.index)}
-            />
-          </div>
-        )
+        cell: props =>
+          props.row.original.is_suggestion ? (
+            <div className='max-w-fit'>
+              <MiniButton
+                noHover
+                title='Принять предложение'
+                icon={<IconAccept size='1rem' className='icon-green' />}
+                onClick={() => handleAcceptSuggestion(props.row.original)}
+              />
+              <MiniButton
+                noHover
+                title='Игнорировать предложение'
+                icon={<IconRemove size='1rem' className='icon-red' />}
+                onClick={() => handleDeclineSuggestion(props.row.original)}
+              />
+            </div>
+          ) : (
+            <div className='max-w-fit'>
+              <MiniButton
+                noHover
+                title='Удалить'
+                icon={<IconRemove size='1rem' className='icon-red' />}
+                onClick={() => handleDeleteSubstitution(props.row.original)}
+              />
+            </div>
+          )
       })
     ],
-    [handleDeleteRow, colors, prefixID]
+    [handleDeleteSubstitution, handleDeclineSuggestion, handleAcceptSuggestion, colors, prefixID]
+  );
+
+  const conditionalRowStyles = useMemo(
+    (): IConditionalStyle<IMultiSubstitution>[] => [
+      {
+        when: (item: IMultiSubstitution) => item.is_suggestion,
+        style: {
+          backgroundColor: colors.bgOrange50
+        }
+      }
+    ],
+    [colors]
   );
 
   return (
@@ -265,6 +328,7 @@ function PickSubstitutions({
             <p>Добавьте отождествление</p>
           </NoData>
         }
+        conditionalRowStyles={conditionalRowStyles}
       />
     </div>
   );
diff --git a/rsconcept/frontend/src/dialogs/DlgEditOperation/DlgEditOperation.tsx b/rsconcept/frontend/src/dialogs/DlgEditOperation/DlgEditOperation.tsx
index 093e0f2b..e20adc3f 100644
--- a/rsconcept/frontend/src/dialogs/DlgEditOperation/DlgEditOperation.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgEditOperation/DlgEditOperation.tsx
@@ -1,7 +1,7 @@
 'use client';
 
 import clsx from 'clsx';
-import { useCallback, useEffect, useMemo, useState } from 'react';
+import { useCallback, useLayoutEffect, useMemo, useState } from 'react';
 import { TabList, TabPanel, Tabs } from 'react-tabs';
 
 import BadgeHelp from '@/components/info/BadgeHelp';
@@ -54,7 +54,10 @@ function DlgEditOperation({ hideWindow, oss, target, onSubmit }: DlgEditOperatio
     () => inputOperations.map(operation => operation.result).filter(id => id !== null),
     [inputOperations]
   );
+
   const [substitutions, setSubstitutions] = useState<ICstSubstitute[]>(target.substitutions);
+  const [suggestions, setSuggestions] = useState<ICstSubstitute[]>([]);
+
   const cache = useRSFormCache();
   const schemas = useMemo(
     () => schemasIDs.map(id => cache.getSchema(id)).filter(item => item !== undefined),
@@ -63,11 +66,11 @@ function DlgEditOperation({ hideWindow, oss, target, onSubmit }: DlgEditOperatio
 
   const canSubmit = useMemo(() => alias !== '', [alias]);
 
-  useEffect(() => {
+  useLayoutEffect(() => {
     cache.preload(schemasIDs);
   }, [schemasIDs]);
 
-  useEffect(() => {
+  useLayoutEffect(() => {
     if (cache.loading || schemas.length !== schemasIDs.length) {
       return;
     }
@@ -86,13 +89,14 @@ function DlgEditOperation({ hideWindow, oss, target, onSubmit }: DlgEditOperatio
     );
   }, [schemasIDs, schemas, cache.loading]);
 
-  useEffect(() => {
+  useLayoutEffect(() => {
     if (cache.loading || schemas.length !== schemasIDs.length) {
       return;
     }
     const validator = new SubstitutionValidator(schemas, substitutions);
     setIsCorrect(validator.validate());
     setValidationText(validator.msg);
+    setSuggestions(validator.suggestions);
   }, [substitutions, cache.loading, schemas, schemasIDs.length]);
 
   const handleSubmit = useCallback(() => {
@@ -151,10 +155,11 @@ function DlgEditOperation({ hideWindow, oss, target, onSubmit }: DlgEditOperatio
           isCorrect={isCorrect}
           substitutions={substitutions}
           setSubstitutions={setSubstitutions}
+          suggestions={suggestions}
         />
       </TabPanel>
     ),
-    [cache.loading, cache.error, substitutions, schemas, validationText, isCorrect]
+    [cache.loading, cache.error, substitutions, suggestions, schemas, validationText, isCorrect]
   );
 
   return (
diff --git a/rsconcept/frontend/src/dialogs/DlgEditOperation/TabSynthesis.tsx b/rsconcept/frontend/src/dialogs/DlgEditOperation/TabSynthesis.tsx
index be822e37..0be98073 100644
--- a/rsconcept/frontend/src/dialogs/DlgEditOperation/TabSynthesis.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgEditOperation/TabSynthesis.tsx
@@ -16,6 +16,7 @@ interface TabSynthesisProps {
   schemas: IRSForm[];
   substitutions: ICstSubstitute[];
   setSubstitutions: React.Dispatch<React.SetStateAction<ICstSubstitute[]>>;
+  suggestions: ICstSubstitute[];
 }
 
 function TabSynthesis({
@@ -25,7 +26,8 @@ function TabSynthesis({
   validationText,
   isCorrect,
   substitutions,
-  setSubstitutions
+  setSubstitutions,
+  suggestions
 }: TabSynthesisProps) {
   const { colors } = useConceptOptions();
   return (
@@ -36,6 +38,7 @@ function TabSynthesis({
         rows={10}
         substitutions={substitutions}
         setSubstitutions={setSubstitutions}
+        suggestions={suggestions}
       />
       <TextArea
         disabled
diff --git a/rsconcept/frontend/src/models/oss.ts b/rsconcept/frontend/src/models/oss.ts
index e5b33c3b..a768a547 100644
--- a/rsconcept/frontend/src/models/oss.ts
+++ b/rsconcept/frontend/src/models/oss.ts
@@ -133,6 +133,7 @@ export interface IMultiSubstitution {
   original: IConstituenta;
   substitution: IConstituenta;
   substitution_source: ILibraryItem;
+  is_suggestion: boolean;
 }
 
 /**
diff --git a/rsconcept/frontend/src/models/ossAPI.ts b/rsconcept/frontend/src/models/ossAPI.ts
index d5d6bbde..fd158c5a 100644
--- a/rsconcept/frontend/src/models/ossAPI.ts
+++ b/rsconcept/frontend/src/models/ossAPI.ts
@@ -10,7 +10,6 @@ import { Graph } from './Graph';
 import { ILibraryItem, LibraryItemID } from './library';
 import { ICstSubstitute, IOperation, IOperationSchema, SubstitutionErrorType } from './oss';
 import { ConstituentaID, CstClass, CstType, IConstituenta, IRSForm } from './rsform';
-import { inferClass } from './rsformAPI';
 import { AliasMapping, ParsingStatus } from './rslang';
 import { applyAliasMapping, applyTypificationMapping, extractGlobals, isSetTypification } from './rslangAPI';
 
@@ -59,6 +58,7 @@ type CrossMapping = Map<LibraryItemID, AliasMapping>;
  */
 export class SubstitutionValidator {
   public msg: string = '';
+  public suggestions: ICstSubstitute[] = [];
 
   private schemas: IRSForm[];
   private substitutions: ICstSubstitute[];
@@ -102,6 +102,7 @@ export class SubstitutionValidator {
   }
 
   public validate(): boolean {
+    this.calculateSuggestions();
     if (this.substitutions.length === 0) {
       return this.setValid();
     }
@@ -118,6 +119,55 @@ export class SubstitutionValidator {
     return this.setValid();
   }
 
+  private calculateSuggestions(): void {
+    const candidates = new Map<ConstituentaID, string>();
+    const minors = new Set<ConstituentaID>();
+    const schemaByCst = new Map<ConstituentaID, IRSForm>();
+    for (const schema of this.schemas) {
+      for (const cst of schema.items) {
+        if (this.originals.has(cst.id)) {
+          continue;
+        }
+        if (cst.cst_class === CstClass.BASIC) {
+          continue;
+        }
+        const inputs = schema.graph.at(cst.id)!.inputs;
+        if (inputs.length === 0 || inputs.some(id => !this.constituents.has(id))) {
+          continue;
+        }
+        if (inputs.some(id => this.originals.has(id))) {
+          minors.add(cst.id);
+        }
+        candidates.set(cst.id, applyAliasMapping(cst.definition_formal, this.mapping.get(schema.id)!).replace(' ', ''));
+        schemaByCst.set(cst.id, schema);
+      }
+    }
+    for (const [key1, value1] of candidates) {
+      for (const [key2, value2] of candidates) {
+        if (key1 >= key2) {
+          continue;
+        }
+        if (schemaByCst.get(key1) === schemaByCst.get(key2)) {
+          continue;
+        }
+        if (value1 != value2) {
+          continue;
+        }
+        if (minors.has(key2)) {
+          this.suggestions.push({
+            original: key2,
+            substitution: key1
+          });
+        } else {
+          this.suggestions.push({
+            original: key1,
+            substitution: key2
+          });
+        }
+      }
+    }
+  }
+
   private checkTypes(): boolean {
     for (const item of this.substitutions) {
       const original = this.cstByID.get(item.original);
@@ -242,7 +292,7 @@ export class SubstitutionValidator {
         continue;
       }
       const substitution = this.cstByID.get(item.substitution)!;
-      if (original.cst_type === substitution.cst_type && inferClass(original.cst_type) === CstClass.DERIVED) {
+      if (original.cst_type === substitution.cst_type && original.cst_class !== CstClass.BASIC) {
         if (!this.checkEqual(original, substitution)) {
           this.reportError(SubstitutionErrorType.unequalExpressions, [substitution.alias, original.alias]);
           // Note: do not interrupt the validation process. Only warn about the problem.
@@ -320,7 +370,6 @@ export class SubstitutionValidator {
       } else {
         substitutionText = applyAliasMapping(substitution.parse.typification, baseMappings.get(substitution.schema)!);
         substitutionText = applyTypificationMapping(substitutionText, result);
-        console.log(substitutionText);
         if (!isSetTypification(substitutionText)) {
           this.reportError(SubstitutionErrorType.baseSubstitutionNotSet, [
             substitution.alias,
diff --git a/rsconcept/frontend/src/pages/ManualsPage/items/cc/HelpConceptOSS.tsx b/rsconcept/frontend/src/pages/ManualsPage/items/cc/HelpConceptOSS.tsx
index 2baec617..47a02dad 100644
--- a/rsconcept/frontend/src/pages/ManualsPage/items/cc/HelpConceptOSS.tsx
+++ b/rsconcept/frontend/src/pages/ManualsPage/items/cc/HelpConceptOSS.tsx
@@ -46,8 +46,9 @@ function HelpConceptOSS() {
       <p>
         Операция синтеза в рамках ОСС задаются набором операций-аргументов и <b>таблицей отождествлений</b> понятий из
         КС, привязанных к выбранным аргументам. Таким образом{' '}
-        <LinkTopic text='конституенты' topic={HelpTopic.CC_CONSTITUENTA} /> в каждой КС разделяются на исходные
-        (дописанные), наследованные, отождествленные (удаляемые).
+        <LinkTopic text='конституенты' topic={HelpTopic.CC_CONSTITUENTA} /> в каждой КС разделяются на исходные и
+        наследованные. При формировании таблицы отождествлений пользователю предлагается синтезировать производные
+        понятия, выражения которых совпадают после проведения заданных отождествлений.
       </p>
       <p>
         После задания аргументов и таблицы отождествления необходимо единожды{' '}
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx
index 3673e065..09da2b38 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorConstituenta/FormConstituenta.tsx
@@ -5,7 +5,7 @@ import { AnimatePresence } from 'framer-motion';
 import { useEffect, useLayoutEffect, useMemo, useState } from 'react';
 import { toast } from 'react-toastify';
 
-import { IconChild, IconParent, IconSave } from '@/components/Icons';
+import { IconChild, IconPredecessor, IconSave } from '@/components/Icons';
 import RefsInput from '@/components/RefsInput';
 import MiniButton from '@/components/ui/MiniButton';
 import Overlay from '@/components/ui/Overlay';
@@ -249,14 +249,14 @@ function FormConstituenta({
               <Overlay position='top-[0.1rem] left-[0.4rem]' className='cc-icons'>
                 {state?.is_inherited_parent ? (
                   <MiniButton
-                    icon={<IconChild size='1.25rem' className='clr-text-red' />}
+                    icon={<IconPredecessor size='1.25rem' className='clr-text-red' />}
                     disabled
                     titleHtml='Внимание!</br> Конституента имеет потомков<br/> в операционной схеме синтеза'
                   />
                 ) : null}
                 {state?.is_inherited ? (
                   <MiniButton
-                    icon={<IconParent size='1.25rem' className='clr-text-red' />}
+                    icon={<IconChild size='1.25rem' className='clr-text-red' />}
                     disabled
                     titleHtml='Внимание!</br> Конституента является наследником<br/>'
                   />