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

Difficulty: Easy

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

Difficulty: Hard

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

Difficulty: Very easy

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

Difficulty: Medium