def concat(self, one, two):
if not len(one) == len(two) == <NUM_LIT:6>:<EOL><INDENT>raise ValueError("<STR_LIT>")<EOL><DEDENT>self.a, self.b, self.c, self.d, self.e, self.f = TOOLS._concat_matrix(one, two)<EOL>return self<EOL>
Multiply two matrices and replace current one.