11.   We cannot exclude the possibility, however, that other unknown mechanisms may be involved in the effects observed in this study.

12.   DNA analysis in this patient allowed us to exclude the possibility of tumour seeding along the needle biopsy track of the original tumour.

13.   These patients should, therefore, be fully investigated to exclude the possibility of colonic cancer, in addition to stopping the drugs.

14.   The guidelines exclude the possibility of assessment of the bargain under the contract as described above.

15.   And Zyuganov was careful not to exclude the possibility that the Communists might eventually acquiesce in the nomination.

16.   But he has not excluded the possibility.

17.   He did not exclude the possibility of a VAT tax increase.

18.   If this statement is thought to exclude other possibilities, it is too stringent a requirement.

19.   NATO has not excluded this possibility, but it is also not currently considering such steps.

20.   Rubin said he could not exclude the possibility that the rebel leaders were somehow tied to the killings.