Eurypygidae[?]
Otididae[?]
Gruidae
Aramidae
Heliornithidae
Psophiidae
Cariamidae[?]
Rhynochetidae[?]
Rallidae[?]
Mesitornithidae[?]
Pteroclidae[?]
Thinocoridae[?]
Pedionomidae
Scolopacidae
Rostratulidae
Jacanidae
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... written as a single fraction; the common denominator is 4a2. W ...