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§ 81 mains the same in all positions (unless affected § 70 iii). See dayar 4, 5, 73, 78, etc.,  100, 456, 459, daear  70,  107,  97, gaeaf  277,  1269, kynhaeaf  73,  53,  271,  14/11, kynhayaf  8, haearn  118, hayarn 119, r͑aeadɏr  1255. The sound is attested in cynghanedd lusg:

The exceptions to the general rule are the following (‘ultima’ being understood to include ‘monosyllable’):

ei occurs in the ultima when followed by two consonants, or by l for lᵹ, r for rr, thus beirdd ‘bards’, teifl ‘throws’, eithr ‘except’, gweheirdd D.G. 20 ‘forbids’, meirw̯ pl. of marw ‘dead’, deil ‘holds’ for *deilᵹ, ceir ‘cars’, pl. of carr. Before l usage varies: lleill ‘others’, y naill ‘the one’, ereill or eraill ‘others’. In polysyllables it sometimes occurs before m or ch; dychleim Gr.O. 90 ‘leaps up’, myneich ‘monks’. But ai appears before nc, nt, sg, as cainc ‘branch’, maint ‘size’, henaint ‘old age’, braisg ‘thick’; also in Aifft, enghraifft, aillt.

As a contraction of e-i the diphthong is now written and spoken ei (that is əi̯), as ceir, gwneir; but ai was common formerly, as cair, gwnair.

eu is now commonly written, when absolutely final, in polysyllables, except when it is a plural or pronominal ending; as goreu, goleu, dechreu for gorau, golau, dechrau. It survived from Ml. W. under the