Transistor also works bidirectinaly commment

Explanation

To understand how a transistor can work bidirectionally, let's break down the explanation step by step.

### Step-by-Step Solution:

1. **Understanding the Basic Structure of a Transistor**:
- A transistor consists of three regions: two N-type regions and one P-type region. In an NPN transistor, the structure is as follows:
- Emitter (N) - Base (P) - Collector (N).

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