Exactly one of the 93 four-element additively idempotent semirings with quasi-antichain additive reduct, namely S(4,435), is nonfinitely based; the other 92 are finitely based.
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The finite basis problem for additively idempotent semirings of order four, II
Exactly one of the 93 four-element additively idempotent semirings with quasi-antichain additive reduct, namely S(4,435), is nonfinitely based; the other 92 are finitely based.