6. Assume that we have 4 classes (Vehicle, Car, Sedan and Bicycle) and variables of each of these classes are: [ 1 Mark Vehicle v; Car c; Seedan s; Bicycle b; The following assignments are all legal: v=s;v=b;c=s; The following assignments are illegal: c=v;c=b;b=c; Draw the class diagram to show relationship between Vehicle, Car, Seedan and Bicycle based on given legal and illegal assignments. (Hint: Use Subtype/Supertype concept)