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    \$\begingroup\$ You can take 5 bytes of if you do n='\n' and use n instead of '\n'. You could take another 8 off if you used a lambda instead of printing: n='\n';lambda x,y:n.join(x+n+n.join(x[:-i]for i in range(1,len(x)-1))+n+n.join(y[:i]for i in range(1,len(y)+1))) \$\endgroup\$ Commented Sep 3, 2016 at 23:01