Mesorat%20hashas for Chullin 130:23

וכי תימא כיון דשוו בד' סימנין מייתינן ולא פרכינן

Should you, however, suggest that as long as they are all alike in that they each have the four abovementioned characteristics, an analogy may be drawn and no objection can be raised, in that case the hargol need not have been mentioned, for since it has these four characteristics it could have been derived from the arbeh and the sol'am.

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