Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 7.2.3)
Copyright (c) 1990-2015 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

X = ab,
Y = cde,
Z = zz,
E = len(wrap(- (ab+cde*4)/6+xyz, 'Start>', (<)+ (end*3+zz*2))),
R = '29'.


% halt