Khi chu?n b? cho l? khai tr??ng, b?n có hai l?a ch?n: t? tay chu?n b? mâm cúng ho?c nh? ??n d?ch v? bên ngoài.The disjoint union of two or more sets is analogous to your union, but, if two sets have components in prevalent, these aspects are regarded as unique during the disjoint union. This is often received by labelling the elements from the