-MITE( B-, A-, A+) + MITE ( B+, A+ A- )
The MITE is the MInimum TEtrahedral allspace filler. Each MITE is comprised of one B module and two A modules. MITES are positive or negative according to the B module's sign (+ or -). Positive and negative MITES are outwardly identical in shape and interchangeable in allspace packing. MITES form into COUPLERS as they pack into allspace.