Differentiate between Phellem and phelloderm

Explanation

### Step-by-Step Solution:

1. **Definition**:
- **Phellem**: Commonly known as cork, it is a protective layer found in the outer part of the periderm.
- **Phelloderm**: Referred to as secondary cork, it is located on the inner side of the periderm.

2. **Location**:
- **Phellem**: Positioned on the outer side of the periderm.
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