Most of those models were not sold concurrently. The Apple II, II+, and IIe each replaced the previous model; the same was true of the IIc and IIc Plus. "//e" was an alternate textual rendering of IIe, not a separate model.

The most Apple II models that were sold concurrently were the IIe Platinum, IIc Plus, and IIgs. (And this was around 1990, at which point there were far more models of Macintosh computers on the market.)

The 2 and 2+ were concurrent.

The 2e, 2e enhanced, 2c, 2c+ and 2gs were concurrent.

I didn’t bother with Mac because I got tired of writing all the things.

//e was a separate model from the ][+

64kb RAM + 80col card vs 48kb/40col