2	3	7	8
7					6
					10
1			7		4	5	8
3	5
								8	2
		4	1	5		10			7
				10
				7					3
9	10	5	2

Difficulty: Very easy (0)

		6		10		1	9
9
						7	1	5
2				1		4
	8	10					6
		2					7	8
			3		7				8
	7	5	10
									7
		3	5		1		10

Difficulty: Very easy (0)

		6		1				3	2
	2			9	4
3	9				2
	5			2
		8
							6
					9			10
				5				1	6
				8	7			9
1	3				10		2

Difficulty: Easy (0)

6						4		3
		9					6		8
8	1	10
	7				8	6			1
1							10
		6							5
2			8	5				1
							7	5	3
9		8					1
	6		4						2

Difficulty: Easy (0)