Find the co-related terms.
12 pairs : Ribs :: 33 : ______

Explanation

To find the co-related terms for the given question, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the First Term**: The first term given is "12 pairs : Ribs". This indicates that there are 12 pairs of ribs in the human body.

2. **Understand the Relationship**: The relationship here is that "Ribs" are a part of the human skeletal system, and specifically, there are 12 pairs of ribs.

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