and there's three of us EDP auditors and one of the three of us has an accounting background and so she's not real proficient in PCs and the other
Two of the three of us do not have accounting backgrounds. 
mnli hypothesis: Two of the three of us do not have accounting backgrounds.  premise: and there's three of us EDP auditors and one of the three of us has an accounting background and so she's not real proficient in PCs and the other