I won't give the right answers here. If you want to know the right answers, come to see me.
3.2.6 There are more than one possibilities. 'Pleasant' may be the only word, but there are phrases, too.
3.3.10 All your cases should add up to 4!=24.
3.4.9 It's not easy to obtain a simple mathematical expression like that in the corollary. The simplest thing to do is to figure out the cycle decomposition.