code: public final void reset() {
      numCoupons = 0;
      mergeFlag = false;
      fiCol = 0;
  
      windowOffset = 0;
      slidingWindow = null;
      pairTable = null;
  
      kxp = 1 << lgK;
      hipEstAccum = 0;
    }
docs: Resets this sketch to empty but retains the original LgK and Seed.