51.   I learned things that I never knew before about how hard comedy is.

52.   If Chinese intelligence is identified as a source of funds, then Judiciary must know it before making impeachment judgments.

53.   I want to have a good visit with a man I knew before the primaries.

54.   If Castellanos was little known to the broader public before this week, he has long been viewed by political professionals as a master of brass-knuckles campaigning.

55.   If only the Nets knew before the championship series began what they know now.

56.   If Cohen had known Bosnia long before the war, he would be even more certain of the truth of this explanation.

57.   In addition, Gabdulla said, the Tatars and other Muslims in Russia now have to deal with drug use and trading, which they never knew before.

58.   It was not known before that many American troops were taking far more PB tablets than prescribed.

59.   It was something they knew long before.

60.   It will be perhaps five or six years before scientists know whether the introduction of condors into Arizona has been successful.