Ix	[[54, 79]]
Iy	[[54, 79]]

X	[4]	[[54, 55]]
Y	[3]	[[59, 79]]

Ix	[[54, 55]]
Iy	[[59, 74], [78, 79]]

X	[4]	[[54, 55]]
Y	[3, 0]	[[69, 74], [0, 0]]
Y	[2, 1]	[[64, 74], [78, 79]]
Y	[1, 2]	[[59, 61], [78, 79]]

Ix	[[54, 55]]
Iy	[[59, 61], [64, 69], [72, 74], [78, 79]]

X	[4]	[[54, 55]]
Y	[1, 0, 0, 2]	[[59, 61], [0, 0], [0, 0], [78, 79]]
Y	[0, 1, 1, 1]	[[0, 0], [64, 67], [72, 74], [78, 79]]
Y	[0, 0, 3, 0]	[[0, 0], [0, 0], [72, 73], [0, 0]]

Ix	[[54, 55]]
Iy	[[59, 61], [66, 67], [72, 74], [78, 79]]

X	[4]	[[54, 55]]
Y	[1, 0, 0, 2]	[[59, 61], [0, 0], [0, 0], [78, 79]]
Y	[0, 1, 1, 1]	[[0, 0], [66, 67], [72, 73], [78, 79]]
Y	[0, 0, 3, 0]	[[0, 0], [0, 0], [72, 73], [0, 0]]

Ix	[[54, 55]]
Iy	[[60, 61], [66, 67], [72, 73], [78, 79]]

X	[4]	[[54, 55]]
Y	[1, 0, 0, 2]	[[60, 61], [0, 0], [0, 0], [78, 79]]
Y	[0, 1, 1, 1]	[[0, 0], [66, 67], [72, 73], [78, 79]]
Y	[0, 0, 3, 0]	[[0, 0], [0, 0], [72, 73], [0, 0]]