"We've talked that over," Mike answered. "Jill is going with me - nobody else.  I do need somebody with me, Jubal; I know quite well that I don't know, as yet, how people do things out in the world.  I still make mistakes; I need a guide, for a time.  I think it ought to be Jill, because she wants to go on learning Martian - and the others think so, too.  But if you want Jill to stay, then it could be someone else.  Duke and Larry are each willing to help me, if you can't spare one of the girls."