5
	3	6			1			7
			2				5
							4
		4
			6		3			1
							7
2

Difficulty: Medium

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

Difficulty: Medium

					4
	3	7			5
						6
				2
1
			1					2
	6					5
	3						4
					7

Difficulty: Medium

							1
	7	4			6		5
			3
3			2
					7
	4
	6
				2		5	1

Difficulty: Medium