Oxygen required. for the combustion of safety matches can be produced from `"___________"`

Explanation

To answer the question regarding the source of oxygen required for the combustion of safety matches, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Combustion**:
- Combustion is a chemical process where a substance reacts with oxygen to produce heat and light. In the case of safety matches, oxygen is necessary for them to ignite and burn.

2. **Identifying the Source of Oxygen**:
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