# Enumerate elements of a set built using properties

How can I enumerate all the elements of a set?

For example (I'll use latex to describe the desired set) if the set is:

$$ W = { u_{i}[j], \overline{u}_{i}[j]: 1 \leq i \leq n, 1 \leq j \leq m } $$

Explain what u_i[j] and \bar{u}_i[j] mean.