This formula says that any call to the codice_3 method must be immediately preceded by a call to codice_2 method that returns true. The property here is parametric in the Iterator codice_13. Conceptually, this means that there will be one copy of the monitor for each possible Iterator in a test program, although runtime verification systems need not implement their parametric monitors this way. The monitor for this property would be set to trigger a handler when the formula is violated (equivalently when the finite state machine enters the "error" state), which will occur when either codice_3 is called without first calling codice_2, or when codice_2 is called before codice_3, but returned false.