Name:                         'A'..'Z'
Variable:                     'a'..'z'
Number:                       '0'..'9'
String:                       '''<any but '''>'''
Decimal number as string:     "<number>"
Data:                         @<number|string|decnum>
Label:                        $<name>
Jump to after label:          %<name>
Input:                        ;<variable>
Output:                       :<variable|data>
Expression:                   ^ @'1'..'0' <data|variable> <data|variable> <function>