In case my fingers, on which I was counting, got tangled or lost, the basic sequence in "C" would be C...E...A(7)..D7...G. Some numbers leave out the "E" depending on the tune but once you learn the sounds of these in sequence you can second guess your way around variations, which includes a lot of raggy blues type stuff and barrelhouse numbers. A good basic song to learn to this pattern is "Don't Let your Deal Go Down" which is also rousing fun to sing.

A