:- consult('/home/student/plnxt/plnxt.pl').
 
start :-
    nxt_open,
    trigger_killall,
    trigger_create(_,check_line,[nxt_stop,nxt_rotate(350,120),start]),
    nxt_go(300).
 
check_line :-
    nxt_light(Light,force),
    Light < 50.
 
:- start.