x_{1} (sequence) is the concatenation of sequences x_{2} and x_{3} (and x_{4}, x_{5}, ...)

x_{1} is a string composed of exactly substrings which are the various x_{i}'s (i>1) in the order of increasing i value, starting with i=2, without skipping. See also: porsi. Operator/connective: joi'i.

- joi'i
- mekso string operator (n-ary): formal right-concatenation; X
_{1 + X}, where X_{i}is a string/word/text/character/letteral/lerfu/quoted utterance (quote appropriately iff necessary; preserve and be careful about the use-vs.-mention distinction) for all i. - ke'u'i
- accepts number (n) after: repeat last sumti up to n times