use the ? sign for blank (empty tile)
him8, hip8, hom8, hop8, mho8, ohm8, phi8, pho8, poh8, imp7, mop7, pom7, hoi6, moi5, poi5,
hm7, hi5, ho5, oh5, mi4, mo4, om4, op4, pi4, po4, io2, oi2,
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