foo Foo foo42 foo_42 _ok 

true false

0001 42 17 666

"Froztpuck" "This is a string" "42" "Anything goes @#$!\n+*-// 
/* not a comment. */
still a string."

:= = != <= >= < > + - * / % ^ ! & |

. ( { } )

if while else print readint printnl readbool