Solve by observation

Contributed by: Schroeder

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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