Suppose a counter has three states namely Q₀, Q₁ and Q₃. Their levels may be 0 to 1, 0 to 1 and 1 to 0 respectively. If a positive edge will change the state of Q₀ from 1 to 0, which will force Q₁ from 1 to 0 and Q₃ from 0 to 1. Determine what type of counter have this effect.