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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Easy (0)

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

Difficulty: Very easy (0)