what were the join years of the high schools of the genesee county b league.
1954, 1960, 1950, 1950, 1960, 1977, 1950, 1950, 1964, 1940, 1950, 1950, 1976, 1950, 1976, 1956 2nd: 1964, 1974, 1950, 1960
which of these years involve two non-consecutive tenures?
1956 2nd: 1964
which of the schools joined these years?
lakeville