Initialize S and G:

G:                      [? ? ? ?]

S:                      [9s bkfst fri $]

=============================================
After example 2, which is a negative example:

G:            [9s ? ? ?] [? bkfst ? ?] [? ? ? $]

S:                      [9s bkfst fri $]

=============================================
After example 3, which is a positive example:

G:                 [9s ? ? ?] [? ? ? $]

S:                      [9s ? ? $]

=============================================
After example 4, which is a negative example:

G:                      [9s ? ? ?] 

S:                      [9s ? ? $]

=============================================
After example 5, which is a negative example:

G:                      [9s ? ? $] 

S:                      [9s ? ? $]

=============================================