// Test this using
// Markov example.mrk "a B F of A and A and A."
// in the command line. It should output
// a bag full of apples and apples and apples.

rules
"B" -> "bag"
"F" -> "full"
"A" -> "apples"

// Production rules end with a "."
// It is called terminating rule 

= a B F of A and A and A.
