(base) 581$ swipl -l class10.prolog 
Welcome to SWI-Prolog (threaded, 64 bits, version 9.2.8)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.

For online help and background, visit https://www.swi-prolog.org
For built-in help, use ?- help(Topic). or ?- apropos(Word).

?- s(Parse,[the,boy,saw,a,man],[]).
Parse = s(np(dt(the), nn(boy)), vp(vbd(see_ed), np(dt(a), nn(man)))) ;
ERROR: Stack limit (1.0Gb) exceeded
ERROR:   Stack sizes: local: 0.8Gb, global: 0.2Gb, trail: 1Kb
ERROR:   Stack depth: 7,455,836, last-call: 0%, Choice points: 12
ERROR:   Possible non-terminating recursion:
ERROR:     [7,455,834] user:np(<compound np/2>, [length:2], _59658028)
ERROR:     [7,455,833] user:np(<compound np/2>, [length:2], _59658062)
   Exception: (13) vp(_9782, [saw, a, man], []) ? abort
% Execution Aborted
?- s(Parse,[the,boy,saw,a,man,with,a,telescope],[]).
Parse = s(np(dt(the), nn(boy)), vp(vbd(see_ed), np(np(dt(a), nn(man)), pp(in(with), np(dt(a), nn(telescope)))))) ;
ERROR: Stack limit (1.0Gb) exceeded
ERROR:   Stack sizes: local: 0.8Gb, global: 0.2Gb, trail: 0Kb
ERROR:   Stack depth: 7,456,199, last-call: 0%, Choice points: 15
ERROR:   Possible non-terminating recursion:
ERROR:     [7,456,197] user:np(<compound np/2>, [length:2], _59652602)
ERROR:     [7,456,196] user:np(<compound np/2>, [length:2], _59652636)
   Exception: (13) vp(_148, [saw, a, man, with, a, telescope], []) ? abort
% Execution Aborted
?-