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Given that $f(\mathrm{y})=|\mathrm{y}| / \mathrm{y}$, and $\mathrm{q}$ is any non-zero real number, the value of $|\mathrm{f}(\mathrm{q})-\mathrm{f}(-\mathrm{q})|$ is

1. $0$
2. $-1$
3. $1$
4. $2$