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  1. or download this
    s/ ^ \b (?<head> [ \w \s \[ \] ]+ \s+ \( ) $ 
        (?<body> .*? ^\)$ ) 
...
     unless $+{head} ~~ m|^\w+?clk\[\d\]|;
   $+{head} . $+{body}
 /gemsx;
  2. or download this
    doit if $x ~~ / (?<x1> \w+)\s+(?<x2> \w+) /x and
        $y ~~ / (?<y1> \w+)\s+(?<y2> \w+) /x and
        $+{x1} . $+{y2} eq $+{y1} . $+{x2};
  3. or download this
    {
    my %+;
...
            $y ~~ / (?<y1> \w+)\s+(?<y2> \w+) /x and
            $+{x1} . $+{y2} eq $+{y1} . $+{x2};
}