Bob loves foreign languages and wants to plan his course schedule to take the following nine language courses: LA15, LA16, LA22, LA31, LA32, LA126, LA127, LA141, and LA169.
The course prerequisites are:
• LA15: (none)
• LA16: LA15
• LA22: (none)
• LA31: LA15
• LA32: LA16, LA31
• LA126: LA22, LA32
• LA127: LA16
• LA141: LA22, LA16
• LA169: LA32
Find a sequence of courses that allows Bob to satisfy all the prerequesites.
