Just one more question. The Ps group is moving straight ahead and contacting an enemy group. Could they choose NOT no line up as they are a group moving straight ahead and contacting an enemy front corner? I guess the answer is yes.
I guess the answer is no, the Ps are not contacting an element group but an enemy element.
Even more, the whole Ps group cannot line up using the emtlu. Only the contacting element could.
If Ps wants to make contact it is indeed only one element that can do so.