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    D1 MEMBERS INFO

    D2 BOOKS INFO

    WRITING MEMBER

    DATA

    CHECKING MEMBER INFO

    CHECKING

    BOOK INFO

    CHECKING

    AVAILABILITY

    1

    CHECK

    VALIDITY

    3

    CREATE BILL

    MEMBER

    MEMBER

    REQUESTRECEIVING

    BILL

    RECORDING

    BOOK DATA

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    CHECK

    AVAILABILITY

    BOOK

    LIST OF BORROWEDBOOKS