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Theorem step-W1-W2

⊦ ( (ctrok(gs.ctr, gs.writers) ∧ writersOk(gs.p, gs.writers) ∧ pendingOk(gs.p)) ∧ notMember(ls.t, gs.readers) ∧ notMember(ls.t, gs.writers) ∧ noPendingW(ls.t, gs.p)) ∧ pre(gs, ls, W1, a) ∧ pcstepf(gs, ls, W1, a) = W2 → ( ctrok(gstepf(gs, ls, W1, a).ctr, gstepf(gs, ls, W1, a).writers) ∧ writersOk(gstepf(gs, ls, W1, a).p, gstepf(gs, ls, W1, a).writers) ∧ pendingOk(gstepf(gs, ls, W1, a).p)) ∧ notMember(lstepf(gs, ls, W1, a).t, gstepf(gs, ls, W1, a).readers) ∧ notMember(lstepf(gs, ls, W1, a).t, gstepf(gs, ls, W1, a).writers) ∧ noPendingW(lstepf(gs, ls, W1, a).t, gstepf(gs, ls, W1, a).p) ∧ noPending(lstepf(gs, ls, W1, a).t, gstepf(gs, ls, W1, a).p)

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