1.   In comparing the strength of tendons between animals, research has found that the absolute strength of tendons varies widely in the thoroughbred population.

2.   But hardly anybody argues that Clinton could win re-election without California, given the way his strength varies elsewhere.

3.   Still, labor strength varies greatly from state to state.

4.   The gist of the report is that America has fine research institutions in virtually every region, though strengths clearly vary by school.

5.   The whitening agent is usually carbamide peroxide or hydrogen peroxide, and strength varies.

6.   The winning strengths varied from expertise in retail bond sales to getting low interest rates, and one winner is a woman-owned firm.