if ( --VALID STATE 1, 0000--) {
    # Do something here
}
elsif ( --VALID STATE 2, 1000--) {
    # Do something here
}
elsif ( -- And so on for your 5 valid states) {
}
else {
    # This is where your 11 INVALID states drop down.
    # Does it really matter *which* invalid state it is?
}