!frame_counter = $13
!sprite_id_table = $9e

	LDA !frame_counter
	AND #$0f
	CMP #$0c
	BPL Done
	TAX
	LDA !sprite_id_table,X
	BIT #$02
	BNE +
	LDA #$80
	BRA ++
+	LDA #$0e
++	STA !sprite_id_table,X
Done:
	RTL

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