Compare the first letters of several names to find matches and non-matches.
Some names start with the very same letter as yours. Some do not. Today you go looking for matches.
Two names that start the same way share something special, even if the rest of the name is different.
Mastery looks like: They can sort a small set of names into matching and non-matching first letters, correctly and independently.
Common stumbles: Matching by name length instead of first letter; assuming two matching first letters means the whole names match.