Problem: S1: At least one improved and one supersonic ramp is used , but subsonic ramps can be used for multiple supersonic seals .
S2: At least one improved and one supersonic ramp is used , but for multiple supersonic seal subsonic ramps can be used .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: The qualification rounds for the four previous World Cups were very controversial , with confusing rules and many failures .
S2: The qualification rounds for the four previous World Cups were very controversial , with confusing rules and many withdrawals .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: Doyle said the Maryland -- Pennsylvania Mason -- Dixon line is exactly :
S2: Doyle said the Maryland -- Pennsylvania Mason -- Dixon line is exact :

Do S1 & S2 convey the same information?

A:
yes