First of all, grasp a principle: the main person in charge of the party is 1, and the main person in charge of the government is No.2.
Secondly, when the number of participants is odd: No.65438 +0 is in the middle, and No.2 is on the left hand side of No.65438 +0; No.3 is located on the right hand side of 1; No.4 is on the left hand side of No.2; Number 5 is on the right of number 3, and so on.
Third, when the number of participants is even: 1 and No.2 are both in the middle and the largest on the left, that is, No.2 is located on the left hand side of No. 1, number 3 is on the right hand side of number 3. 1 and so on.