28
xyz
C	-3	0.57735  0	
C	-3	1.73205	 0
C	-2	2.3094	 0 
C	-3	-2.88675 0
C	-3	-1.73205 0
C	-2	-1.1547	 0
C	-2	0	 0
C	-1	0.57735	 0
C	-1	1.73205	 0
C	0	2.3094	 0
C	-2	-3.4641	 0
C	-1	-2.88675 0
C	-1	-1.73205 0 
C	0	-1.1547  0
C	0	0        0 
C	1	0.57735  0
C	1	1.73205  0
C	2	2.3094   0 
C	0	-3.4641  0 
C	1	-2.88675 0
C	1	-1.73205 0
C	2	-1.1547	 0
C	2	0	 0
C	3	0.57735	 0
C	3	1.73205	 0
C	2	-3.4641	 0
C	3	-2.88675 0
C	3	-1.73205 0