In stem(p,i,j), p is a char pointer, and the string to be stemmed is from pi to pj inclusive. Typically i is zero and j is the offset to the last character of a string, (p[j+1] == '\0'). The stemmer adjusts the characters pi ... pj and returns the new end-point of the string, k. Stemming never increases word length, so i <= k <= j. To turn the stemmer into a module, declare 'stem' as extern, and delete the remainder of this file.