In a generATe and test algorithm, combining part of the filter with the generATor in order to reduce the number of potential solutions generATed. A trivial example: filter (< 100) [1..1000] ==> [1..99] where [1..n] generATes the list of integers from 1 to n. Here the filter has been combined completely with the generATor. This is an example of fusion. (2005-03-18)