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sbds_get_index(?Var, -Idx)
get the index of an SBDS attributed variable
- Var
- SBDS variable
- Idx
- The index of Var
Description
	Unifies Idx with the index of the SBDS variable Var.  The index of
	the variable is its position in the matrix provided in the
	corresponding call to sbds_initialise/4 or sbds_initialise/5
Fail Conditions
Var is not an SBDS variable.