From My Shadow I have a little shadow that goes in and out with me,
And what can be the use of him is more than I can see.
He is very, very like me from the heels up to the head;
And I see him jump before me, when I jump into my bed.
The funniest thing about him is the way he likes to grow
Not at all like proper children, which is always very slow;
For he sometimes shoots up taller like an India-rubber ball,
And he sometimes gets so little that there's none of him at all.
(from "My Shadow" by Robert Louis Stevenson)
Which is the rhyme scheme in these stanzas?
1. abab cdcd
2. abab abab
3. aabb ccdd.
4. aabb aabb