 We may also assume that the same would apply to the "-v" ~ "-i" pair, i.e.if by adding "-v" we had a homophone, we must add "-i" instead; the same well have applied to the "-f" ~ "y" pair, i.e.if by adding "-f" we had a homophone, we must add "-y" {IPA|[ˈjai̯}} instead; but as these suffixes derive from the word "fy", it may be that Dutton, following 1 above, would have added "-fy".