R15c

R15cR15cR15cR15c
R15cR15cR15cR15cR15cR15cR15cR15c
R15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15c
R15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15cR15c
R15cR15cR15cR15cR15cR15cR15cR15c