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

Difficulty: Very easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)