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  1. or download this
    sub p {
    map{$_[$_]+=$_[$_+1]for 0..$#_;@_=(1,@_);print"@_\n"}1..pop
    }
    
  2. or download this
    sub p {
    @_=(1,map$_[-2]+pop,@_),print"@_\n"for 1..pop 
    }