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#!/bin/sh

hxtoh()
{
    flag=1
    while read -r str; do
        case $str in
            HXCOMM*)
            ;;
            STEXI*|ETEXI*) flag=$(($flag^1))
            ;;
            *)
            test $flag -eq 1 && echo "$str"
            ;;
        esac
    done
}

hxtotexi()
{
    flag=0
    while read -r str; do
        case "$str" in
            HXCOMM*)
            ;;
            STEXI*|ETEXI*) flag=$(($flag^1))
            ;;
            DEFHEADING*)
            echo $(expr "$str" : "DEFHEADING(\(.*\))")
            ;;
            *)
            test $flag -eq 1 && echo $str
            ;;
        esac
    done
}

case "$1" in
"-h") hxtoh ;;
"-t") hxtotexi ;;
*) exit 1 ;;
esac

exit 0