keys/words/wordcodec.go
func MustLoadCodec(bank string) *WordCodec {
	codec, err := LoadCodec(bank)
	if err != nil {
		panic(err)
	}
	return codec
}
func MustLoadCodec(bank string) *WordCodec {
	codec, err := LoadCodec(bank)
	if err != nil {
		panic(err)
	}
	return codec
}
// MustLoadCodec panics if word bank is missing, only for tests