@Mark
 That's right! But the code is error prone! If you change the begin end by 
mistake it still works!
My sygesstion is

range[a,b], if a< b then step=1
range[a,b], if a>b then step=-1
range[a,b,c], if a<b, then c>0  otherwise empty list
range [a,b,c] if a a>b then c<0 otherwise empty list


The python range function can used to correct the code!

Mohammad

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