Provide an example of

1) a first-order logic formula that contains only bound variables (use at least two variables)

2) a first-order logic formula that contains both, bound variables and free variables (any number > 0 of bound variables and any number > 0 of free variables)

3) Illustrate with one example the De Morgans laws (that is, two examples in total, one for each law), by

constructing a specific interpretation in each case.