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Decoder [TOC]
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The ALU will be controlled by 8-bit wide commands. For a command in the form
$(a_7, a_6, a_5, a_4, a_3, a_2, a_1, a_0)$, we introduce the designations Op,
`X`, `Y`, `Z`, and `XY` as follows:

- `Op` (for Operation Code) denotes the bits $(a_7, a_6)$.
- `X` represents the bits $(a_5, a_4)$.
- `Y` represents the bits $(a_3, a_2)$.
- `Z` represents the bits $(a_1, a_0)$.
- `XY` is the concatenation of `X` and `Y` and represents the bits
   $(a_5, a_4, a_3, a_2)$.

Implement the following circuit in CircuitVerse to easily access these areas of
the bit pattern:

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session04/s04_7.png
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