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====== Distance ======
Distance(<-start <-end) ->dist

===== Description =====
Returns the distance between two given vector positions.
Note that the vectors can be 1,2,3, or 4 dimensional.

===== Examples =====
<code 4rpl>
distance(V3(0 0 0) V3(10 20 30)) ->dist
trace(<-dist)
</code>