- Pliers are made of two levers for gripping
- Pliers are a kind of hand tool
- Therefore, pliers are a tool made of two levers for gripping

- Pliers are a tool made of two levers for gripping
- Gripping produces gripping force
- Hence, pliers are a tool that can produce gripping force

- Pliers are a tool that can produce gripping force
- A gripping force can be used to tighten a mechanical fastener
- Therefore, pliers can be used to tighten a mechanical fastener

Therefore, pliers can be used to tighten a mechanical fastener
Question: Which of the following tools is most useful for tightening a small mechanical fastener?
Context: - Pliers are made of two levers for gripping 
- Pliers are a kind of hand tool 
- A gripping force can be used to tighten a mechanical fastener 
- Gripping produces gripping force