. , Lr−1, first set li = Li n , then: • Define ai , the normalized centre of the (i − 1)st run: ai = i−1 j=0 lj − 1 2 li−1, • Define bi , the normalized centre of ith run: bi = i−1 j=0 lj + 1 2 li • Hence, define the power of the boundary between these runs, Pk i : Pk i = min{p ∈ N : ⌊ai · kp⌋ < ⌊bi · kp⌋} BEN SMITH WILLIAM CAWLEY GELLING, MARKUS E. NEBEL, AND SEBASTIAN WILD 5 / 16