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    does recursion allow as to move one step backward i dont no why you say that we just built this recursive stack. [RevPr1(RevPr2(RevPr3(RevPr4)))] in which line does it mean that and if it is a stsck so we moves backward why does it read the only last code (print (head.data)) i am sorry if i didnot explain my problem in easy way so you can understand me as i am a beginner thanks for your explanation