How Do I Extract Elements from an Array?

[aurillo, gabriel]

I have an array, as follows:

@allLines = (
        "line1 = value1",
        "line2 = value2",
        "line3 = value3",
        "!line4 = value1",
        "!line5 = value2",
        "!line6 = value3",
        "line7 = value7",
        "line8 = value8",
        "line9 = value9",
        "line10 = value10"
) ;

How do I loop through each line with the following criteria:
If the line starts with a bang (!) AND the value has already
been "seen", skip that line AS WELL AS the line previously
seen. In this case, the remaining list should only have lines
7 to 10 because line 4 starts with a bang AND the value is
equal to the value of line 1. And so on...

Any help would be greatly appreciated. Thanks.

Gabe

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