pe'o PEhO …KUhE cmavo

forethought flag for mathematical expression (mex) Polish (forethought) operator.

On affix form:

pendo
x1 is/acts as a friend of/to x2 (experiencer); x2 befriends x1.

In notes:

kei'au
mekso operator: finite result set derived from/on set A with/due to operator/function B under ordering of application C
li'ei
arbitrary character string or irregular number
sau'i (exp!)
mekso n-ary operator: reciprocal of the sum of the reciprocal of each of X1, X2, ..., Xn (for any natural number n); 1/((1/X1) + (1/X.