during the course of a frame the spots can become covered or partially
covered by another ball other than the correct ball for that spot.
a colour cannot be re-spotted cleanly (without touching another
ball) on its own spot, it is re-spotted on the highest value spot
available at that time.
black spot should be checked first to see if it is available and
then the remaining spots should be considered in the normal order
of pink, blue, brown, green and yellow.
all the spots are occupied, the ball is placed as near to its own
spot as possible, without touching another ball.
Placement should be in a direct line with the nearest point of the
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