anonymous monadic functions.  '(y+y)12  =>  24
dyadic function call function ".  f<:x+y  3"f4  => 7
use execute for function calls allowing multi-line functions. eg.
./inca
        f<(:t<x+y);(:z<t.t)
2 6
t<x+y
z<t.t
        3"f4
2 6
t<x+y
z<t.t

49
(f of course clobbers global variable t)