function EqualityConstraint(var1, var2, strength) {
  EqualityConstraint.superConstructor.call(this, var1, var2, strength);
}
function EqualityConstraint(var1, var2, strength) {
  EqualityConstraint.superConstructor.call(this, var1, var2, strength);
}
function EqualityConstraint ( var1 , var2 , strength ) { EqualityConstraint . superConstructor . call ( this , var1 , var2 , strength ) ; }
/* --- *
E q u a l i t  y   C o n s t r a i n t
--- 
Constrains two variables to have the same value.
/ * --- * E q u a l i t y C o n s t r a i n t --- Constrains two variables to have the same value .