Test 1:
X
X
1
X
1
2
X
1
2
3
X
X
1
X
1
2
X
1
2
3
Test 2:
1
X
1
2
X
1
2
3
X
1
X
1
2
X
1
2
3
X
Test 3:
1
X
1
X
2
1
X
2
3
1
X
2
3
4
1
X
1
X
2
1
X
2
3
1
X
2
3
4
Test 4:
X
1
1
X
2
1
2
X
3
1
2
3
X
4
X
1
1
X
2
1
2
X
3
1
2
3
X
4