day 4, easy
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# awk -F ',|-' -f part1.awk input
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($3>=$1 && $4<=$2) || ($1>=$3 && $2<=$4) {n++}
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END {print n}
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# awk -F ',|-' -f part2.awk input
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$3>$2 || $1 > $4 {n++}
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END {print NR-n}
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