These adjustments are subject to enforceability issues in certain situations. Watchful waiting may be appropriate for certain types. These are necessary to gain points with certain factions. Such applications raise the question of fast generation of permutations satisfying certain desirable properties. Surveying instruments have characteristics that make them suitable for certain uses. Some may experience irritation from the use of certain lubricants. The conditions are expressed in terms of the ranks of certain submatrices. Other legal impediments to certain boycotts remain. This created confusion with regard to certain anniversaries. This is particularly common with certain programming languages. Darkening of the skin in certain areas may also occur. Specific antidotes are available for certain overdoses. They thus recommend screening in people with certain health problems. Further confusion existed over the validity of certain names. Some schools provide Mandarin and Tamil as languages of instruction for certain subjects.