Letters that make unrepeatable
a, b, e, l, n, p, r, t, u are letters that make 'unrepeatable'
Words within unrepeatable
tab, rep, table, AB, ab, pe, re, repeat, pea, UN, at, Ea, able, eatable, repeatable, Re, LE, At, Ta, peat, Ab, eat are words within 'unrepeatable'