public void FlashLetterInWord(LetterData letterToFlash, Color color)
{
if (flashLetterInWordCoroutine != null) {
StopCoroutine(flashLetterInWordCoroutine);
}
flashLetterInWordCoroutine = FlashLetterInWordCoroutine(letterToFlash, color);
StartCoroutine(flashLetterInWordCoroutine);
}