:3
 = 3
 = ""
__ = 2
1 = "" &  _1 = 4
2 = "" &  _2 = 5
1 = ""
2 = ""
3 = ""
1 = "512"
2 = "433"
3 = "124"
1 = "211"
2 = "221"
3 = "221"
goto _
