Read the excerpt from “the pobble who has no toes” by edward lear. what is the rhyme scheme?

the pobble who has no toes
swam across the bristol channel;
but before he set out he wrapped his nose
in a piece of scarlet flannel.
for his aunt jobiska said "no harm
can come to his toes if his nose is warm;
and it's perfectly known that a pobble's toes
are safe,—provided he minds his nose! "

abcb efgf
abbc dede
abab ccdd
abbc deed

abab ccdd

Explanation:

How to find the rhyming scheme:

1. Take the last word of every line

2. Determine which words rhyme

3. Write the letter scheme

Last words:

toes

channel

nose                      "toes" and "nose" rhyme (Line 1 and 3)

flannel                   "channel" and "flannel" rhyme (Line 2 and 4)

harm

warm                     "harm" and "warm" pass as rhyming (Line 1 and 2)

toes

nose                      "toes" and "nose" rhyme (Line 3 and 4)

Use the letters of the alphabet in order. Lines that rhyme use the same letter. Start with the letter "a". To get the next letter, see if the next line rhymes with anything near and before it.

Line 1: a                 - first letter

Line 2: b                - did not rhyme with the line before this one

Line 3: a                - rhymed with line 1

Line 4: b                - rhymes with line 2

Line 5: c                - did not rhyme with anything before

Line 6: c                - kind of rhymes with line 5

Line 7: a/d                - rhymes with line 1, but it was not recent

Line 8: d                - rhymes with line 7

Put the letters together:

abab ccdd