 
 Example 7.1

 Degree of freedom for two components when 
 number of phases is 1 is 3

 Degree of freedom for two components when 
 number of phases is 2 is 2

 Degree of freedom for two components when 
 number of phases is 3 is 1

 Degree of freedom for two components when 
 number of phases is 4 is 0 