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Theorem lookup

aubifs_core_index_lookup#(KEY, RI, FI, RO, FO, FS, LOG, CSYNCED; EXISTS, ND; ERR) {if ri-cons(RI, FS) then {fail_or_success#(; ; ERR); if ERR = ESUCCESS then {EXISTS := KEY ∈ RI; if EXISTS then ND := FS[RI[KEY]] else ND := ?} else EXISTS := ?, ND := ?} else abort }