Answer:
TV or VT
Explanation:
A line is defined by the two points lying on an infinitely long straight paths.
From the picture attached,
There are two endless paths 'l' and 'm' which contain (R, U) and (V, T), intersecting at a point S.
Therefore, line 'm' will be represented by VT or TV.
And line 'l' will be represented by RU or UR.