WIP: edit ex5

Change-Id: I198110f93724f505b1a2d74441a076de1704ce6e
WIP: a very minor change to ex6

Change-Id: I0a278ebc2ab6d78c572a90a7886207d326a9b6f0
WIP: minor changes to ex8 and ex9

Change-Id: Ib6af5586b4354d750df8eee44d8f2fdbefdfb770