Name a member of the lanthanoid series which is well known to exhibit `+4` oxidation state.

Explanation

To solve the question of naming a member of the lanthanoid series that exhibits a +4 oxidation state, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Lanthanoid Series**:
The lanthanoid series consists of 15 elements from lanthanum (La, atomic number 57) to lutetium (Lu, atomic number 71).

2. **Understand Oxidation States**:
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