docs: public int getMessageLength() {
      // Message Type, createIdentifier
      int length = 1 + 1;
  
      // Number of solutions
      length += 4;
  
      // Each solution
      if (this.attributes != null) {
        for (Attribute attr : this.attributes) {
          length += attr.getSolverLength();
        }
      }
  
      return length;
    }