What comes next?

Number Theory Level pending

Suppose there is an operation \(\oplus\) such that

\[ 1 \oplus 2 \oplus 3 = 9 \] \[ 2 \oplus 3 \oplus 4 = 2 \] \[ 3 \oplus 4 \oplus 5 = 8 \] \[ 4 \oplus 5 \oplus 6 = 9. \]

What is the value of \[ 5 \oplus 6 \oplus 7 = ? \]

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