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Theorem change

ebm_change#(VOLID, LNUM, N, BUF; AVOLS; ERR) {if VOLID ∈ AVOLS ∧ LNUM < # AVOLS[VOLID] ∧ N ≤ LEB_SIZE ∧ N ≤ # BUF ∧ is-aligned(N, EB_PAGE_SIZE) then {fail_or_success#(; ; ERR); if ERR = ESUCCESS then AVOLS[VOLID][LNUM] := mapped(subarray(BUF, 0, N) + mkempbuf(LEB_SIZE - N), N)} else abort }