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$spice_str = "VIN IN VSS PWL ( 0ns 0.0 4ns 2.4 25ns 0.0 50ns 2.4 51ns 
+0.0 75ns 2.4 76ns 0.0 100ns 2.4 101ns 0.0 )";

...
foreach ( @text ) {
    print "$_\n";
}

$rest = "+ " . $';