The Hebrew dual ending comes from -aym-; this diphthong was always lost in
BH, either contracted to long e or extended to ayi, with the stress on a.
Yes, the dual is one common place where this diphthong would have occurred,
but it is by no means the only. If there's any reliability to the notion
that m is part of the stem, then it seems to me that this being a dual
ending is an unacceptable option.
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