def cons(self, i):
if self.b[i] in '<STR_LIT>':<EOL><INDENT>return False<EOL><DEDENT>elif self.b[i] == '<STR_LIT:y>':<EOL><INDENT>return True if i == <NUM_LIT:0> else not self.cons(i-<NUM_LIT:1>)<EOL><DEDENT>return True<EOL>
True iff b[i] is a consonant