// Immediately invoked
DIC(INVOCA FVNCTIO (x) VT { REDI (x + I) } (V))

// From an array
DESIGNA fns VT [FVNCTIO (x) VT { REDI (x + I) }]
DIC(INVOCA fns[I] (V))

// Passing a named function as an argument
DEFINI apply (f, x) VT { REDI (INVOCA f (x)) }
DEFINI sqr (x) VT { REDI (x * x) }
DIC(INVOCA apply (sqr, IV))