Explanation of the alpha deduction mechanism is here. From the 1st to the 15th, 10 points per day equals 150 points. On the 15th, airdrop points are deducted by 10 points. The deduction occurs on the 16th. After the points from the 1st are overwritten on the 16th, it is 140 points, plus the deducted 10 points from the airdrop, totaling 130 points on the 16th. The premise is that there were no bonus points from transactions on the 15th. If there are bonus points, just reduce the airdrop points accordingly.