| http://www.w3.org/ns/prov#value | - A degree of difficulty to hit the jackpot is adjusted, i.e. increased by setting the appearing time shorter when the gun 20 is aimed at the jackpot-appearing target and is in the token dischargeable state than otherwise. [0063] Subsequently, the determined time is monitored by a builtin timer for measuring the jackpot appearing time at the target (Step ST71).
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