document: Solution of the safe problem on -LRB- 0,1 -RRB- - matrices A safe problem with mn locks is studied . It is reduced to a system of linear equations in the modulo 2 residue class . There are three possible variants defined by the numbers m and n evenness , with only one of them having a solution . In two other cases , correction of the initial state of the safe insuring a solution is proposed
doc_bio_tags: O O O B I O O O O O O O B I O B I O O O O O O O O O O B I O O B I I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O