=> R0 = 35, &23 (Append sprite)
R1 = Sprite area
R2 = Sprite 1 name/pointer
R3 = Sprite 2 name/pointer __ __
R4 = 0 => Merge horizontally |__|__|
1 => Merge vertically .--.
|--|
'--'
This merges two sprites of the same height or width together. The result is stored as sprite 1 and sprite 2 is deleted, hence no extra memory is needed.
See PRM 1, page 786
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