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How to simplify a list?

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ting138

ting138

MIS
Mar 12, 2002
2
GB
I have a list
[a,b,[c,d,[s,d],[c,d]]]
how can I simplify it down to
[a,b,c,d,s,d,c,d]?
 
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maybe......

concat([], Y, Y).
concat([X | XR], Y, [X | Z]) :- concat(XR, Y, Z).

s([], []).
s([X|XR], [X|Y]) :- atomic(X), !, s(XR, Y).
s([X|XR], Y) :- s(X, X2), s(XR, XR2), concat(X2, XR2, Y).

 
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