Close all open mathematical brackets.

If there are n still-open mathematical brackets (that is: unpaired "vei"s) prior to this word, then this word (without subscript) is equivalent to "ve'o ve'o ... ve'o" (where there are n "ve'o"s in that string). If it is "xi"-subscripted by a nonnegative integer m, then it closes all except (that is, using the previous notation: n minus) the m outermost still-open mathematical brackets; the word unsubscripted is equivalent to as if it were subscripted with no (0) and "ve'o" is equivalent to "ve'oi xi pa"; "ve'oi xi ro" has no effect.