`O`, `A` and `B` are three points that are not in a straight line.
`vec(OA) = ul(a)` and `vec(OB) = ul(b)`.
The point `C` is such that `vec(OC) =
Another point `D` is such that `AB` and `DC` are parallel and of equal length.
`vec(OD) = sul(a) + tul(b)`
Find the value of the scalars `s` and `t`.
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