Consider the following variable declarations in conjunction to the above type declarationsVAR // var declaration section s : T9; t : T9; u : T10; v : array [5][4] of T8; w, z : struct {int a; struct T5* next; }; x, y : struct { int a; struct T5* next; }; f : function of T9 returns int; g : function of T9 returns A; m : int; n : A;Assume that assignments between variables are allowed if the types of the variables are equivalent. For each of the following, list all type equivalence schemes under which the expression is valid. Consider name equivalence, internal name equivalence, and structural equivalence for each case. Assume that if two variables are equivalent under name equivalence, they are also equivalent under internal name equivalence.• s=t;• t=u;• u=v;• v=w;• w=z;• z=x;• m=f(s)• n=f(u)