Philosophy xx1 (deductive reasoning - sentential logic). I desperately need help

True or False

1.) "No M are nonS, but some P are not M, so some nonP are not nonS" is a valid syllogism

2.) The contraposition of an A-type categorical proposition can be formed by performing the following, in order: obversion, conversion, obversion

3.) The Venn diagram used to evaluate a standard form categorical syllogism represents 8 distinct possible categories

4.) "Some S are P" is the obverse of "Some S are non- P".

5.) the term "quadruped" is distributed in the categorical statement that results when "nothing that is quadruped can fail to be an amphibian" is put into standard form