Planned On Outfixes r←x(F↟)y

This primitive or feature is planned, that is, it doesn't appear in the most recent released implementation of TinyAPL. Details may change before it is added!

x must be a scalar natural. r is the result of applying F to outfixes of y defined by |x, i.e. the list y without each infix, as defined in On Infixes. TBD: what modes make sense for outfixes?