7.3a In and En. [XIII.39]

The same braille configurations that represent the whole words in and enough are also used to represent the letters in and en as parts of words. These two part-word lower-sign contractions should be used as parts of words wherever the letters they represent occur, except when specific rules, such as the prefix and suffix rules, limit their use. Consequently, the in sign is used in instant, main, pine, minor, and Carolina. The en sign is used in enforce, often, senior, and Gene. Note that their use does not depend on whether the vowel is long or short.

It should also be borne in mind that where the ing contraction cannot be used because the letters occur at the beginning of the word, as in ingredient, or where the ing contraction would cause difficulty in pronunciation, as in the word lingerie, the in contraction is used. () Also, in the word dinghy, where the n and g are pronounced as two sounds and the g and h are pronounced as one sound, the in and gh contractions are used in preference to the ing contraction. ()