print "and...";

if (true and true) {
    print "should show";
}

if (true and false) {
    print "should not show";
}

if (false and true) {
    print "should not show";
}

if (false and false) {
    print "should not show";
}

print "or...";
if (true or true) {
    print "should show";
}
if (true or false) {
    print "should show";
}
if (false or true) {
    print "should show";
}
if (false or false) {
    print "should show";
}