VALID_ZERO=0
VALID_ONE=1
VALID_TWO=2

VALID_LARGE=99999999
VALID_HUGE=99999999999999999999999999999999

INVALID_SOMETHING=something
INVALID_EMPTY=
INVALID_EMPTY_STRING=""
INVALID_NULL=null
INVALID_NEGATIVE=-2
INVALID_MINUS=-
INVALID_TILDA=~
INVALID_EXCLAMATION=!
INVALID_SPACES=" 123"
INVALID_COMMAS="123,123"