<subst> (substitution) groups one or more deletions with one or more additions when the combination is to be regarded as a single intervention in the text. [11.3.1.5 Substitutions]
that he and his Sister Miſs D — <lb/>who always lived with him, wd. be <subst> <del>very</del> <lb/> <add>principally</add> </subst> remembered in her Will.