Classify the following substances in magnetic and non-magnetic substances:
aluminium, wood, paper, iron, cobalt, brass, nickel

Explanation

To classify the given substances into magnetic and non-magnetic categories, we will analyze each substance based on its magnetic properties.

### Step-by-Step Solution:

1. **Identify Magnetic Substances**:
- Magnetic substances are those that are attracted to magnets. Common examples include iron, cobalt, and nickel.

2. **List the Given Substances**:
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