11.3a Short-form words in conflict with contractions. [XIII.43, XVI.47.e]

Short-form words should not be used as parts of words if their use would violate a basic contraction rule. For example, the short form for before cannot be used in hereinbefore because in order to use the be contraction, which is part of the short form, it must be the first syllable of the word. The same restriction applies to misconceive, where the short form for conceive cannot be used because the con sign does not occur at the beginning of the word. However, where such words are divided between lines, as shown in the following examples, the short-form words are used because then the be and con signs occur at the beginning of a new line. Examples:

before
hereinbefore
herein-
before

conceive
misconceive
mis-
ceive