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- #1 variant
- a = range(1,10)
- for i in a:
- rev = (-1,1)[i % 2]
- print " ".join(map(str, a[:i][::rev]))
- #2 variant
- d = [[str(j) for j in a[:i][::(-1,1)[i % 2]]] for i in a]
- print "\n".join([" ".join(j) for j in d])
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