71.  It is generally associated with hypertension and, for unknown reasons, is common with young black men.

72.  It is usually chronic, but many patients can go into remission for an unknown reason.

73.  Kaiser Aluminum shareholders exchanged their shares for KaiserTech stock, but for some unknown reason your friend failed to make the exchange.

74.  Kevin has, for some unknown reason, been selected to save the world from an equally vague fate at the hands of some angry but unseen aliens.

75.  Katzenmoyer did not pratice, for unknown reasons.

76.  Massachusetts Port Authority officials said they had been told that the man was detained on Friday at the Paris airport for unknown reasons.

77.  Most of the more recent studies involved men from developing countries and their sperm counts, for unknown reasons, tend to be lower.

78.  One theory the investigators will explore is whether there is a continual low level of transmission of Ebola virus that, for some unknown reason, burns out.

79.  Pacific trade winds weaken for unknown reasons, allowing warm air and ocean currents from the South Pacific to hit the west coast of South America.

80.  Police said Harris had been suspended for unknown reasons from Louis D. Brandeis High School before the arrest.