one is lateral, one is vertical.
to help understand the differences between lat/vert, I recommend you pick up a shovel and a stop watch. first run 990m and see how long it takes you. then dig 25 m down and compare the two times.
You should note some stark contrasts in the time it takes you to complete each activity. this should be a very effective exercise in explaining the stark contrasts between horizontal and vertical intersections. they are worlds apart just like the activity you are about to undertake.
watch BOWs sp recover. that is some pretty shrewd dumping by whomever it was.
SF
PS: remember to rehydrate.
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