def feed(self, cube, pair):
self.cube = cube<EOL>if pair not in ["<STR_LIT>", "<STR_LIT>", "<STR_LIT>", "<STR_LIT>"]:<EOL><INDENT>pair = ["<STR_LIT>", "<STR_LIT>", "<STR_LIT>", "<STR_LIT>"][["<STR_LIT>", "<STR_LIT>", "<STR_LIT>", "<STR_LIT>"].index(pair)]<EOL><DEDENT>self.pair = pair<EOL>
Feed Cube to the solver.