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 if ($col6 =~ /^\Q97517\E/ }
    elsif
 $col6 =~ /^\Q97516\E/))

if (CONDITION) {
    ACTION_WHEN_CONDITION_IS_TRUE
}

elsif (ALTERNATIVE_CONDITION) {
    ACTION_WHEN_ALTERNATIVE_CONDITION_IS_TRUE
}

else {
    ACTION_WHEN_CONDITION_IS_FALSE
}

ACTION_WHEN_CONDITION_IS_TRUE if CONDITION;