Yes, that's exactly whay I tried to convey. Now, a 3-D array is just like a 2D-array, but younow add yet another layer/dimension to it. For exampel, space coordinates are 3-D, you need length, width, height, to descirbe a location/point. In case of a 4-D array, you could consider the fourth dimension beigntime, you now need to also describe the time from when you want toe element. Anyway, hope you get the gist of it.
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There are two types of vessels, submarines and targets.