def create_g2p_gt_map(words, pronunciations):
    """Create grapheme-to-phoneme ground true mapping."""
    g2p_gt_map = {}
    for word, pronunciation in zip(words, pronunciations):
        if word in g2p_gt_map:
            g2p_gt_map[word].append(pronunciation)
        else:
            g2p_gt_map[word] = [pronunciation]
    return g2p_gt_map
