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An electron deficient fullerene B12C6N6 is studied by using ab initio calculations.The structure is generated by replacing N with C in the B12N12 cage to ensure only B-C and B-N bonds are formed.All the possible isomers are optimized and the low energy structures are decided.C and N atoms in the low energy isomers are inclined to segregate and form B2C2 and B2N2 squares.