sep="/"
[[ "$0" == *//* ]] && sep="//"
[[ "$1" == ?*"$sep"* ]] || exit 1
key="$(echo "${1%%$sep*}" | lowercase)"
value="${1#*$sep}"
[ -e "wisdom/$key" ] && verb="Relearned" || verb="Learned"
echo "$value" > "$(echo-p "wisdom/$key")" && echo "$verb '$key': $value"