Unquoted string "a" may clash with future reserved word at ./sig.pl line 6.
Unquoted string "z" may clash with future reserved word at ./sig.pl line 6.

 |||||||
 [|0 0|]
  \ - /
   \=/
    ~
Subroutine main::p redefined at ./sig.pl line 6.
 y 4 p #