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Pre-requisite: Throwing first Zaps
Simplified Exercise
The pattern has 4 clubs. We start with 3 clubs to memorize the sequence a bit before having to deal with also catching clubs.
The sequence is zap,zap,zip - and that keeps repeating, so zap,zap,zip,zap,zap,zip,zap,zap,zip… Zaps are throws with little or no spin as described in "Throwing first Zaps", a "zip" is handing the club from one hand to the other (or as a throw from one hand to the other with a very short distance). The first run of the sequence starts from the right hand, the 2nd then begins with the left hand.
You start with two clubs in your right hand and one in your left hand. With three clubs, you can now throw zap(l)-zap(r)-zip(l)-zap(r) - and then you have no clubs left to continue. (r) and (l) denote the hand doing each throw (actually the hand order is always alternating hands: right, left, right…). The last zap that you throw in this exercise already is the first throw of the 2nd run of the sequence.
Each partner just collects the clubs and then throws the same exercise sequence zap(l)-zap(r)-zip(l)-zap(r) back to their partner. If one person does all throws straight and the other person does all throws diagonal, both will have starts of that sequence beginning with the right and with he left hand.