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  1. or download this
    $string = "(x1,x1)(x2,y2)........(xn,yn)"
  2. or download this
    >perl -wMstrict -le
"my $u =
...
 print qq{'$s'};
"
'(x1,y7)(x1,y9)(x2,y3)(x2,y5)(x11,y6)(x11,y8)(x22,y2)(x22,y4)'
  3. or download this
    >perl -wMstrict -le
"my $u =
...
 print qq{'$s'};
"
'(x1,y7)(x1,y9)(x2,y3)(x2,y5)(x11,y6)(x11,y8)(x22,y2)(x22,y4)'