If ' $R$ ' is the least value of ' $a$ ' such that the function $f(x)=x^2+a x+1$ is increasing on $[1,2]$ and ' $S$ ' is the greatest value of ' $a$ ' such that the function $f(x)=x^2+a x+1$ is decreasing on $[1,2]$, then the value of $|R-S|$ is
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