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T1:r(A),w(A),r(B),w(B),c

T2: r(A),r(B),c
how many recoverable schedule possible over T1,T2?
how many cascadeless schedule possible over T1,T2?

T3:w(X);w(Y);R(Z);C;

T4:w(Y);R(Y);C

how many recoverable schedule possible over T3,T4?
how many cascadeless schedule possible over T3,T4?

T5:R(P);R(P);W(Q);W(Q)C;

T6:R(P);W(P);C

how many recoverable schedule possible over T5,T6?
how many cascadeless schedule possible over T5,T6?

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