Problem: Wwo sentences:
A postal distribution center where four anthrax-laced letters passed through two years ago was fumigated with chlorine dioxide gas as crews wound up the decontamination process this weekend .
Workers cleaning up a postal distribution center where four letters laced with anthrax had passed through two years ago planned to complete the fumigation operation early Sunday .
Do they have the same meaning?

Answer: yes

Problem: Wwo sentences:
Courant Staff Writers Matt Eagan and Ken Davis contributed to this story .
Courant Staff Writer Jeff Goldberg contributed to this story .
Do they have the same meaning?

Answer: no

Problem: Wwo sentences:
Mailblocks was founded five years after WebTV was acquired by Microsoft for $ 425 million .
WebTV was sold to Microsoft in 1997 for $ 425 million and today is called MSN TV .
Do they have the same meaning?

Answer: no

Problem: Wwo sentences:
Water samples are being tested in a state lab to determine what caused the reaction .
Water samples are being sent to the state health department for analysis .
Do they have the same meaning?

Answer:
yes