Solve by observation

Contributed by: Schroeder

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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