x · x · x · xfour free-variable muls chained
Eight canonical rewrites that reduce — or relocate — SuperBEST cost. Pick a rewrite to see the before / after cost, the identity that justifies it, and whether it saves nodes or moves from the ELC boundary to the interior.
x · x · x · xfour free-variable muls chained
x^4single EPL(4, x) node on positives
Any fixed-exponent power is one F13 node via EPL. Repeated multiplication is the expensive way to spell it.