Designers often experiment with different combinations of genres. There are about twenty different runway combinations in use. Most games have a variety of winning combinations of symbols. The twelvefold way provides a unified framework for counting permutations, combinations and partitions. Blackcurrants are included in some unusual combinations of foods. Examples to illustrate some of the many possible combinations are given in the table. Investigational treatments include specific antibiotic combinations and mesenchymal stem cells. A terminology to describe the various combinations is provided. A wide array of component combinations exists. There is strong evidence of the use of saltpeter and sulfur in various medicinal combinations. This is because these have the fewest possible combinations. These machines have 280 possible drink combinations to choose from. And also combinations of the above techniques. This results from the many possible allelic combinations. Other conditional jumps test combinations of several flags.