AnalyzerSentence analysis3SpansSentence相互に裏付ける1000 character limitAnalyzeSentence相そう互ごに裏うら付づけるSpan Details相そう互ごmutual; reciprocalnoun, no-adjectiveにdirection, time, indirect object, or target markergrammar裏うら付づけるsupport; back up; substantiate; corroborateichidan verb