31.   In theory, one could not exist without the other, which is why brokerages will fight attempts to split the two.

32.   It exists without slave markets or a formal slave trade.

33.   It cannot exist without a host cell to support it.

34.   It is a company town that, for decades, existed without accountability, transferring all questions and blame onto a secretive, bloated bureaucracy in Washington.

35.   It frames the experience, but the music could exist without it.

36.   Large enterprises with thousands of employees cannot exist without cash.

37.   Life does exist without football, as hard as that may be to believe.

38.   Life here cannot exist without trees, he explained.

39.   Modern genomics would not exist without the recent leaps in computing power.

40.   Neither Hitler nor Pinochet could have existed without the tacit or explicit consent of millions of citizens.