rename 'and' to 'then'
rename 'and' to 'then'

Turns out 'and' is a Python reserved word. Who knew?!

Anyway, our original intention of "then" = ";" probably isn't very
useful. "And" is safer. So let's just stick with the term "then" but
have it mean "and" and pretend that we wanted that all along!

oconnor663/duct,oconnor663/duct.py