Give the systematic IUPAC names of the following compounds :
`CH_3 - overset(C_2 H_5) overset(|)(CH ) - C-= C-CH_2 - C-= C - overset(C_2 H_5 ) overset(|) CH - CH_3`

Explanation

To determine the systematic IUPAC name of the given compound, we will follow the steps outlined in the video transcript, ensuring to identify the longest carbon chain, the position of the double bonds, and the substituents.

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain:**
- The compound has a total of 9 carbon atoms in its longest chain. This chain will include all the functional groups (in this case, the triple bonds).

2. **Number the Carbon Chain:**
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