if you where to combine two civs special abilitys what civs?

[Save_Ferris]

Not sure if it's been mentioned, but Spain + America would make natural wonders accessible and awesome. Aztec + Songhai would give a reason to choose raging barbs. Arabia + Songhai would be awesome for gold. India + Persia would be the best combo I can think of, when you combine faster and longer Golden Ages.