51.   Just how this constitutes the mechanism of a clock remains to be determined.

52.   Major League Soccer is still a paper league, with dozens of details remaining to be resolved before it kicks off in March.

53.   Many details of the business remain to be determined.

54.   Many serious technical problems remain to be resolved, including finding ways to guide the stem cells down desired paths of development and ways to prevent immune rejection.

55.   Much still remains to be decided, both on and off the field.

56.   Murphy said that some issues remain to be resolved with the governments of those two countries before those two pacts can be ratified, though.

57.   Nevertheless, that issue remains to be resolved.

58.   Now a new technique may be about to join this array of powerful tools, although it remains to be seen if its effectiveness will match its conceptual elegance.

59.   Obviously, many privacy issues remain to be resolved.

60.   Of the six teams remaining that are seeded first or second, UConn has had the toughest road so far.