mekso unary operator: converts a string of digits which includes {pi} to the same string of digits without {pi}; if {pi} is not present in the original/input string, the output is identical

Probably can be generalized to handle pi'e and distinguish macro- from micro-digits. Notice that it produces a string of digits; the meaning of this string must be established by processing through JUhU or the like. The input must also be a string of digits (not a number). Useful for certain algorithms, such as an nth root algorithm.

- boi'au
*(exp!)* - immediately convert symbolic string to number (explicit)
- fa'ei
*(exp!)* - Unary mekso operator: reverse finite ordered sequence, tuple, list, string, etc.
- gei'i'e
*(exp!)* - mekso unary operator: converts a string of digits which includes {pi} to the same string of digits without {pi}; if {pi} is not present in the original/input string, the output is identical

- joi'i
*(exp!)* - 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.