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Can there be any simpler logic or more faster way

 
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Hi guys,

I create some program where i want to display all the combinations of String a,b,c,d.This strings can contain N number of items.



Pseudo Code:-
for i in 0 to a.length
for j in 0 to b.length
for k in 0 to c.length
for l in 0 to d.length
call input(a[i],b[j],c[k],d[l]);

Can there be any easier way to do this?
Is there any faster way than this?

Thanks in advance,
 
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that's as fast as it can go,

and you'll want 0 to length-1 on each of those,
 
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