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6A45: Calculate offset right edge position
For offset islands (state_island_byte_3=2). Right edge = $3C + left. This creates an asymmetric island where right edge follows left edge with fixed river width.
calc_offset_edge 6A45 LD A,C A = C + D = 60 + left_x, then jump to draw_right_edge.
6A46 ADD A,D
6A47 JP draw_right_edge
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