lu'erfu fu'ivla

x1 (quote) is a text/word/sequence wherein the characters/phonemes are taken over alphabet x2 (set)

For formal language analysis. In mathematical writing, this relationship is sometimes written as "/"; the set of all x1 (where x2 is specified) is x2* (where "*" is the Kleene star); then x1 is an element/member of x2*, and the letters of x1 are elements/members of x2. While each letter in x1 must be an element of x2, there can be elements of x2 that do not appear in x1.


In notes:

zilterle'u
x1=l2 is a formal character-set/alphabet containing letter(s)/characters/digits/terms x2=l1; x2 is a letter in formal alphabet x1 and is treated formally (it has no meaning, other than possibly being distinct from other letters in x1)
lu'erma
x1 (letteral) is a letter that occurs in word x2 (text); x2 contains an occurrence of x1 as a digit/term in a sequence