31.   Mexico and Oman have already promised to curtail their production, and Angola has said it wants to cooperate.

32.   Oil-related stocks fared better, reflecting hopes that non-OPEC members will also curtail production and, therefore, further stabilize prices.

33.   Previous OPEC agreements to curtail production were often undermined by group members who cheated by pumping more oil than their individual quotas allowed.

34.   So far, tests on rats show that sperm production is curtailed when the rats are given mangosteen extract, Martin said.

35.   The group benefited from the rise in global oil prices since OPEC members agreed in March to curtail production.

36.   Yet each of them has apparently committed to curtailing production.