51.   A common problem in infertile men is a varicocele, or varicose vein in the testicles, that interferes with sperm development.

52.   A common problem is that political leaders allow threats of violence to influence their decisions on government policy.

53.   A common problem, the worker explained.

54.   A dermatologist told her mother, Gayle, that he could eliminate this very common medical problem with four or five treatments.

55.   A common human problem is that every person likes to think that he or she is the norm from which the universe departs at its own peril.

56.   A common problem with the makers of console games is that they have an arcade attitude.

57.   A dozen Division II colleges from Massachusetts, New York and Connecticut found a solution on Wednesday to a common problem.

58.   A common problem for women of every era.

59.   A common problem with inside wooden window frames is that they are sometimes painted shut.

60.   A common problem with sliding doors is misalignment.