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It goes both ways
R
R U
R U B
R U B I
R U B I K
R U B I K S
R U B I K S C
R U B I K S C U
R U B I K S C U B
R U B I K S C U B E
U B I K S C U B E
B I K S C U B E
I K S C U B E
K S C U B E
S C U B E
C U B E
U B E
B E
E
R
R U
R U B
R U B I
R U B I K
R U B I K S
R U B I K S C
R U B I K S C U
R U B I K S C U B
R U B I K S C U B E
U B I K S C U B E
B I K S C U B E
I K S C U B E
K S C U B E
S C U B E
C U B E
U B E
B E
E
