AssociationPair structure is used in relation list (See
IRelation) to store positions of a related pair
of items from associated lists.
typedef struct AssociationPair_
{
int posn0;
int posn1;
double data
} AssociationPair;
Members:
posn0 -
Position of an element from the first list.
posn1 -
Position of an element from the first list.
data - Can be used to store a double number related to the pair
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