We do this by substituting the values of $n$ from 1 to 4 into the given sequence $a_{n}=2n-5$.
For $n=1$, $a_{1}=2(1)-5=-3$.
For $n=2$, $a_{2}=2(2)-5=-1$.
For $n=3$, $a_{3}=2(3)-5=1$.
For $n=4$, $a_{4}=2(4)-5=3$.
So, the first four terms of the sequence are
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