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§ 185

Stems ending in w̯-diphthongs have contracted forms when the endings ‑wn or ‑wch follow; thus táwn for táw-wn ‘let us be silent’, téwch for téw-wch ‘be ye silent’; gw̯randéwch for gw̯randéw-wch ‘listen ye’; clýwn for clýw-wn ‘we hear’, clýwch (re-formed clɥ́wch) for clýw-wch ‘ye hear’ or ‘hear ye’.

Other vowels and diphthongs are not contracted; e.g. gweddī́-ir ‘there will be prayer’, cáe-ent (cáy-ent) ‘let them shut’, béi-id ‘fault was found’, dilḗ-er ‘may be deleted’, cynorthẃy-ynt ‘they assisted’. But for ‑ā́-odd in the 3rd sg. aor.