1. for 0 £ t £ p /2

2. for p /2 £ t £ p

3. for p £ t £ 3p /2

4. for 3p /2 £ t £ 2p

5. for p /2 £ t £ 3p /2

6. for p /5 £ t £ 10p /7

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