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文法P->SS->LS->S;LL->if0E1then2S3endL->ifEthenSelseSendL->repeatSuntilEL->F:=EL->readFL->writeEE->BE->BCBB->TB->BATT->FT->TMFF->idF->(E)F->numA->+A->-M->*M->/C->=