Email Record: Theoretical prediction of the heats of formation, densities, and relative sensitivities for 1,7-dinitro-3.4.5.8-tetra N-oxide-bis([12,3]triazolo)[4,5-b:5',4'-e]pyrazine, 1,7-dinitro-3,5-bis N-oxide-bis([1,2,3]triazolo)[4,5-b:5'4'-e]pyrazine, 1,7-dinitro-1,7-dihydrobis([1,2,3]triazolo)[4,5-b:4'5'-e]pyrazine /