$2.$ Suppose Microsoft and Celera are considering a joint venture to use con$-$ sumer's genetic ngerprints as license keys for software registration. How$-$ ever, in a joint venture there is always the possibility that one partner is trying to extract proprietary trade secrets from the other, rather than trying to earn a joint prot. Suppose that there are two possible types of Microsoft: Friend and Enemy. Microsoft knows its own type, but Celera knows only that two types are equally likely.