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global [black]
to start
ab, setpower 3
set black 300
loop [ if ((sensor 3 )< black
and ((sensor 4) < black))  [fwd] ,if((sensor3) > back
and((sensor4) > black))    [bck],if((sensor3) < black
[right]
if((sensor4) < black) [left]] end tofwd ab,thisway
ab,on end to left a,thatway b,thisway ab,onfor
l end to right b,thatway a,thisway ab,onfor l end.
to bck ab,thatway ab,onfor 2 end

to start
ab,set power 8
loop [ifelse((sensor0))>100]
[up]
[normal]

end
to normal
ab,thisway
ab,on
end
to up
ab,thatway
ab,onfor
ab,onfor 10
ab,onfor (randomrangeols)
end