//#define INS_HEXA // hexagonal interstitial position
//#define INS_TETRA // tetrahedral interstitial position
//#define INS_110DB // 110 dumbbell interstitial position
//#define INS_HEXA // hexagonal interstitial position
//#define INS_TETRA // tetrahedral interstitial position
//#define INS_110DB // 110 dumbbell interstitial position