Solve by observation

Contributed by: Schroeder

A) 4
B) 8
C) 12
D) 0

A) 1
B) 4
C) 2
D) 5

A) 11
B) 21
C) 3
D) 28

A) 4
B) 0
C) 2
D) 1

A) 20
B) 14
C) 4
D) 10

A) 1
B) 5
C) 0
D) 7

A) 0
B) 3
C) 13
D) 1

A) 4
B) 5
C) 17
D) 6

A) 9
B) 2
C) 1
D) 5

A) 12
B) 3
C) 5
D) 1

A) 4
B) 6
C) 8
D) 20

A) 5
B) 11
C) 10
D) 6

A) 10
B) 11
C) 4
D) 21

A) 0
B) 7
C) 2
D) 8

A) 12
B) 6
C) 0
D) 1

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