| ⊦ ( ctrok(gs.fctr, gs.fwriters) ∧ writersOk(gs.bq, gs.pq, gs.fwriters) ∧ pendingOk(gs.bq, gs.pq) ∧ SFTrailing(gs.bq) ∧ readFOsOk(gs.rfo, gs.fwriters)) ∧ FLITLInv(gs, lsf(t), pcf(t)) ∧ (gs.pq(loc) ≠ [] ∧ gs.pq(loc).head.FO?) ∧ gs0 = gs.pq:= gs.pq(loc := gs.pq(loc).tail) → ctrok(gs0.fctr, gs0.fwriters) ∧ writersOk(gs0.bq, gs0.pq, gs0.fwriters) ∧ pendingOk(gs0.bq, gs0.pq) ∧ SFTrailing(gs0.bq) ∧ readFOsOk(gs0.rfo, gs0.fwriters) |