code: static void putEmptyMerged(final WritableMemory wmem,
        final int lgK,
        final short seedHash) {
      final Format format = Format.EMPTY_MERGED;
      final byte preInts = getDefinedPreInts(format);
      final byte fiCol = (byte) 0;
      final byte flags = (byte) ((format.ordinal() << 2) | COMPRESSED_FLAG_MASK);
      checkCapacity(wmem.getCapacity(), 8);
      putFirst8(wmem, preInts, (byte) lgK, fiCol, flags, seedHash);
    }
docs: PUT INTO MEMORY