Secondary variables
Like carry’s in Donald + Gerald, useful for search
- domains will be {0,1}
- also helpful for formulation
vght = 1 ? hgt = h
- I.e. vght = 1 iff guest crew g visits host h at time t
mgft = 1 ? hgt = hft
- I.e. mgft = 1 iff guest crews g and f meet at time t