Identify each of the labeled points $($indicated with letters$)$ or changes $($indicated with two letters separated

$1.$ The transition shown by the line from D to C is Blank.

$2.$ The transition shown by the line from C to E isBlank.

$3.$ The transition shown by the line from F to E is Blank.

$4.$ The point indicated by B is the Blank.

$6.$ The transition shown by the line from E to F is Blank.

$7.$ The point indicated by A is theBlank.

$8.$ The transition shown by the line from C to D is Blank.by an arrow$)$ shown on the phase diagram.