What is the rhyme scheme of the following poem (the / indicates the end of the line): oh mother, mother, where is happiness?/ they took my lover's tallness off to war,/ left me lamenting. Now i cannot guess/ what i can use an empty heart-cup for. / he won't be coming back here any more. / some day the war will end, but, oh, i knew/ when he went walking grandly out that door/ that my sweet love would have to be untrue. / would have to be untrue. Would have to court/ coquettish death, whose impudent and strange/ possessive arms and beauty (of a sort)/ can make a hard man hesitate--and change. / and he will be the one to stammer, "yes. "/ oh mother, mother, where is happiness?/.