— data type: SOLUTION struct {float energy; char *structure;}

— Function: SOLUTION* subopt (char* sequence, char* constraint, int* delta, FILE* fp)

produces all suboptimal secondary structures within delta*0.01 kcal/mol of the optimum. The results are either directly written to a fp (if fp is not NULL), or (fp==NULL) returned in a SOLUTION * list terminated by an entry were the structure pointer is NULL.