Housman is wrong to adduce this line as though it were a statement made under oath (compare the claim made in 26 'littera de uobis est mea questa nihil').
Haec quosdam non sane indoctos viros audio ita pronuntiare ut primam in his litteram corripiant; rationemque dicant, quoniam in verbo principali, quod est ago, prima littera breviter pronuntiatur.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "littera" in a variety of sentences. We hope that you will now be able to make sentences using this word.