question: returns the index of the first occurrence of the specified chapter in sub chapters list . concode_field_sep VariantMap attributes concode_elem_sep boolean cleaned concode_elem_sep Text text concode_elem_sep WeakReference<Chapter> parent concode_elem_sep Set<Consumer<? super Chapter>> cleaners concode_elem_sep List<Chapter> chapters concode_field_sep Chapter getParent concode_elem_sep String debug concode_elem_sep void swap concode_elem_sep void dumpTo concode_elem_sep Chapter replace concode_elem_sep void clear concode_elem_sep void clear concode_elem_sep void insert concode_elem_sep Chapter checkChapter concode_elem_sep boolean remove concode_elem_sep Iterator<Chapter> iterator concode_elem_sep void removeCleanup concode_elem_sep int size concode_elem_sep void cleanup concode_elem_sep Chapter clone concode_elem_sep Chapter removeAt concode_elem_sep void finalize concode_elem_sep String toString concode_elem_sep void setParent concode_elem_sep boolean isSection concode_elem_sep void registerCleanup concode_elem_sep List<Chapter> items concode_elem_sep void append concode_elem_sep Chapter chapterAt
target: int function ( @ NonNull Chapter arg0 ) { return arg0 . getParent ( ) != this ? - 1 : chapters . indexOf ( arg0 ) ; }