#!/bin/sh

SEP='\t'
COLUMNS='4 5'

main() {
    while read -r line; do
        filename=
        i=0
        for c in $COLUMNS; do
            f="$(echo "$line" | awk -F$SEP "{print \$$c}")"
            [ -z "$f" ] && continue
            if [ "$filename" = '' ]; then
                filename="$(echo "$f" | tr '[:upper:]' '[:lower:]' | sed -E -e 's/ /-/g' -e 's/[^a-z0-9-]//g' -n -e 's/^(.{0,128}).*$/\1/p')"
            fi
            echo "$f" > "$filename.$i.md"
            i=$((i+1))
        done
    done
}

main "$@"