how would you say the following things in fol? use the following symbolizations:
r = robert, l = laura, human(x) = x is a human, az(x) = x is an arizonan.
also, use only the truth-function connectives "~" and "^".
a. robert is a human, and laura is a human.
b. laura is a human, and robert isn't.
c. laura is a human and arizonan.
d. laura and robert are both humans, but laura is an arizonan and robert isn't.
e. neither laura nor robert are humans.