Thanks for the question! So with the overall game set up for this one, we know it's going to be a linear ordering game. First, we're told that H goes before R, so
H - R
Then, we're given a conditional.
G - T - > R&S - T (using shorthand because of typing on a keyboard, we don't know about the relative order of R and S)
Then, we know that
H - ST v ST - H (without saying anything about the relative order or position of ST)
We can also sketch out one of the possible scenarios if we want, which is when G comes before T, since that means T comes dead last.
G
H - R - T / S
Also, one of the diagonal lines might not appear, so if you see blank space, assume a diagonal line connecting G to T, H to S, and S to T. That's the overall set up. Hope this helps.