Changes
From Final Fantasy Inside
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* '''const UByte''' ''B'': Bank to retrieve ''A'', or zero if ''A'' is specified as a literal.
* '''const UByte''' ''A'': The ID of the background area to clear, as specified in the background's sprite, or the address to retrieve the value if ''B'' is non-zero.
==== Description ====
Hides all portions of background whose sprite specifies that it belongs to the background area given by ''A''.