Input Strings:
snap(12345,Charlie Brown,Manager,555-1234).
snap(67890,Lucy,Right Field,555-5678).
snap(22222,Linus,2nd Base,555-9999).
snap(33333,Snoopy,Catcher,555-1234).
csg(CS101,12345,A).
csg(CS101,67890,B).
csg(CS101,33333,A-).
csg(EE200,12345,C).
csg(EE200,22222,B+).
csg(EE200,33333,B).
**Error: xxxx
csg(PH100,33333,A).
csg(PH100,67890,C+).
cdh(CS101,M,9AM).
cdh(CS101,W,9AM).
cdh(CS101,F,9AM).
cdh(EE200,T,10AM).
cdh(EE200,Th,10AM).
cdh(PH100,T,11AM).
cdh(PH100,Th,11AM).
cr(CS101,1170 TMCB).
cr(EE200,B92 JFSB).
cr(PH100,3106 JKB).

Vectors:
snap(12345,Charlie Brown,Manager,555-1234)
snap(67890,Lucy,Right Field,555-5678)
snap(22222,Linus,2nd Base,555-9999)
snap(33333,Snoopy,Catcher,555-1234)
csg(CS101,12345,A)
csg(CS101,67890,B)
csg(CS101,33333,A-)
csg(EE200,12345,C)
csg(EE200,22222,B+)
csg(EE200,33333,B)
csg(PH100,33333,A)
csg(PH100,67890,C+)
cdh(CS101,M,9AM)
cdh(CS101,W,9AM)
cdh(CS101,F,9AM)
cdh(EE200,T,10AM)
cdh(EE200,Th,10AM)
cdh(PH100,T,11AM)
cdh(PH100,Th,11AM)
cr(CS101,1170 TMCB)
cr(EE200,B92 JFSB)
cr(PH100,3106 JKB)

Course Grades:
CS101,Charlie Brown,A
CS101,Lucy,B
CS101,Snoopy,A-

EE200,Charlie Brown,C
EE200,Linus,B+
EE200,Snoopy,B

PH100,Snoopy,A
PH100,Lucy,C+

Student Schedules:
Charlie Brown, 12345, Manager, 555-1234
  CS101 MWF 9AM, 1170 TMCB
  EE200 TTh 10AM, B92 JFSB

Lucy, 67890, Right Field, 555-5678
  CS101 MWF 9AM, 1170 TMCB
  PH100 TTh 11AM, 3106 JKB

Linus, 22222, 2nd Base, 555-9999
  EE200 TTh 10AM, B92 JFSB

Snoopy, 33333, Catcher, 555-1234
  CS101 MWF 9AM, 1170 TMCB
  EE200 TTh 10AM, B92 JFSB
  PH100 TTh 11AM, 3106 JKB