51.   The ALA estimates that those represent only one-fourth of actual complaints since libraries call them to report challenges on a voluntary basis.

52.   The NBA originally prohibited veterans from participating, then did an about-face yesterday and said they could take part on a voluntary basis.

53.   The State Department considers the tests repugnant and rarely employs them, and then only on a voluntary basis.

54.   The vaccinations will be administered, on a voluntary basis, during school hours on Friday.

55.   The U.S. Supreme Court said they can continue on a voluntary basis.

56.   The Yankees opened their parking lot gates and were ready for major league business on a voluntary basis Monday, but only three players trickled in.

57.   The thought of players practicing on a voluntary basis during a lockout by the owners had some players laughing with sarcasm.

58.   This left the program on a voluntary basis for all agencies.

59.   Until then, automakers would sell electric vehicles in the state on a voluntary basis.