It makes no sense. Try replacing "l" with any noun.
In an introductory course teaching the alphabet with learners who do no know any Greek it's hard to come with a noun. What we did here was present a letter and a word containing that letter. There will be better sentences down the tree.
On the other hand "l" can be easily seen as an "I". Perhaps another letter would serve the purpose better. Keep up the good work.
Not true look at other Duolingo languages