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The correct sequence of the steps to the proof is:
**Step 2**: For a contradiction, assume that t is rational, and write r and s as fractions.
**Step 4**: Find a common denominator.
**Step 1**: Subtract, writing s as a fraction.
**Step 3**: Realize a contradiction.
So, the correct order is:
**Step 2, Step 4, Step 1, Step 3**.