x1 is (n) less than x2 in metric x3 [ni, default cardinality]
I.e. |x2| - n = |x1| where x3 determines how to measure |x|. Practically, this can be used, e.g. «djica tu'a le pa zau'ei be lei titla» for "I want one less candy". See also: zau'ei, ze'au, ja'au Etymology: me'a+mei (note that me'a ny. mei means something different).