code: static CpcSketch uncompress(final CompressedState source, final long seed) {
      checkSeedHashes(computeSeedHash(seed), source.seedHash);
      final CpcSketch sketch = new CpcSketch(source.lgK, seed);
      sketch.numCoupons = source.numCoupons;
      sketch.windowOffset = source.getWindowOffset();
      sketch.fiCol = source.fiCol;
      sketch.mergeFlag = source.mergeFlag;
      sketch.kxp = source.kxp;
      sketch.hipEstAccum = source.hipEstAccum;
      sketch.slidingWindow = null;
      sketch.pairTable = null;
      CpcCompression.uncompress(source, sketch);
      return sketch;
    }
docs: also used in test