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Spaced repetition: each system comes back just before you would forget it. Fast, correct answers stretch the interval; a miss brings it back the same day.

Free practice: Spider Web System (거미줄 시스템)Score 0/0
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On the table, the ringed ball is your ball (1).
Spider Web System (거미줄 시스템)
Arrival = Start − Aim + Spin
Your ball:White(cue ball · 1)
Other balls:YellowRed
Expected shot:Spider Web System (거미줄 시스템)Bricole (cushion first)Cushion orderShort → Long → Short

The cue ball goes to the cushions before touching any ball; after the cushions in order it hits the balls.

Given:
Aim20Spin (level × 10)0Start30
In this position, what is Arrival?

Task: put the given values into the system's formula and calculate Arrival. Enter the answer as the number read on the table's Arrival scale.