Combine any number of codes according to customer needs for laser printing. For example, the combination of a group of codes is "A + B + C", and the sequence can be freely swapped back and forth "C + A + B" to achieve any combination. For example, A: 123, B: 456, C: 789, the combination method "C + A + B", the result: 789123456, the laser will print according to the combination result, increasing the flexibility and expandability of the code number printing content.