def p_Revisions(self, p):
n = len(p)<EOL>if n == <NUM_LIT:3>:<EOL><INDENT>p[<NUM_LIT:0>] = ('<STR_LIT>', p[<NUM_LIT:1>][<NUM_LIT:1>] + [p[<NUM_LIT:2>]])<EOL><DEDENT>elif n == <NUM_LIT:2>:<EOL><INDENT>p[<NUM_LIT:0>] = ('<STR_LIT>', [p[<NUM_LIT:1>]])<EOL><DEDENT>
Revisions : Revisions Revision
                     | Revision