Question 7
John the beaver is training to become a martial artist. He needs to master six actions: lying down, standing, running, jumping, rolling and sitting.
His teacher can teach several lessons, each containing some actions.
- Lesson 1. Counterattack: running and sitting.
- Lesson 2. Endurance: standing and sitting.
- Lesson 3. Holding out: standing, running, jumping and sitting.
- Lesson 4. Recovery: standing, jumping and rolling.
- Lesson 5. Attack: lying down and standing.
- Lesson 6. Struggle: running.
John wants to choose lessons covering every action, while taking as few lessons as possible so he has more time to practice.
What is the minimum number of lessons he needs?
His teacher can teach several lessons, each containing some actions.
- Lesson 1. Counterattack: running and sitting.
- Lesson 2. Endurance: standing and sitting.
- Lesson 3. Holding out: standing, running, jumping and sitting.
- Lesson 4. Recovery: standing, jumping and rolling.
- Lesson 5. Attack: lying down and standing.
- Lesson 6. Struggle: running.
John wants to choose lessons covering every action, while taking as few lessons as possible so he has more time to practice.
What is the minimum number of lessons he needs?