// p05input4.txt - Test Size()

# Test correctness of size when adding student objects
c
p
s
+  1234 Jefferson  Thomas
p
s
+  888  Nixon      Richard
p
s
+  5678 Washington George
p
s
+  555  Lincoln    Abraham
p
s
+  1000 Madison    James
p
s
d


# Test correctness of size when deleting student objects
c
s
+  1234 Jefferson  Thomas
+  888  Nixon      Richard
+  5678 Washington George
+  555  Lincoln    Abraham
+  1000 Madison    James
p
s
- 555
p
s
- 1234
p
s
- 888
p
s
- 5678
p
s
- 1000
p
s
d


# Test correctness of size when adding and deleting student objects
c
+  1234 Jefferson  Thomas
s
+  888  Nixon      Richard
s
+  5678 Washington George
p
s
- 888
p
s
+  555  Lincoln    Abraham
p
s
+  1000 Madison    James
p
s
- 1234
p
s
d



# Test correctness of size for empty tree
c
p
s
d