diff --git a/Example50_Flight.mp b/Example50_Flight.mp
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+/* Model of a commercial flight, November 27, 2013
+
+This model demonstrates the interlacing of root events as Phases 
+and as Actors.  The commented out code at the bottom represents
+a simulation of COORDINATE statements with SHARE ALL statements before
+COORDINATE statements were implemented in the early MP tools.
+
+*/
+
+/*-----------------------------------------------------
+ 	Phases
+-----------------------------------------------------*/
+
+SCHEMA Flight
+
+
+
+ROOT Preflight: BoardAircraft 		
+				FlightCheck 
+				DepartureClearance  	
+				Pushback 
+				IssueGroundInstruction 	
+				Taxi ;
+
+ROOT Takeoff: 	Clear_for_takeoff 	
+				Liftoff 
+				Handoff_to_TRACon ;
+
+ROOT Departure: ChangeFrequency 
+				IssueClearances 
+				Handoff_to_ARTCC ;
+
+ROOT EnRoute: 	IssueInstruction
+				( OceanicExtension | Follow_route )
+				ChangeFrequency2 
+				Handoff_to_TRACon2 ;
+
+ROOT Descent: 	Clear_descent
+				Maneuver_toward_Airport ;
+
+ROOT Approach: 	[ Hold ] 	
+				Clear_approach
+				Enter_approach_line
+				Handoff_to_tower ;
+
+ROOT Landing: 	Clear_landing
+				Land
+				Taxi_instruction
+				Taxi_to_gate
+				Disembark ;
+
+/*-----------------------------------------------------
+	Actors
+-----------------------------------------------------*/
+
+ROOT Passenger: BoardAircraft 
+				InsideCabin 
+				Disembark ;
+
+ROOT Pilot: 	FlightCheck 
+				Pushback 
+				Taxi 
+				Liftoff 	
+				ChangeFrequency
+				( OceanicExtension | Follow_route )
+				ChangeFrequency2
+				Maneuver_toward_Airport
+				[ Hold ] 		
+				Enter_approach_line
+				Land
+				Taxi_to_gate ;
+
+ROOT Controller: 	DepartureClearance 
+					IssueGroundInstruction 
+					Clear_for_takeoff 	
+					Handoff_to_TRACon
+					IssueClearances 
+					Handoff_to_ARTCC 
+					IssueInstruction 
+					Handoff_to_TRACon2
+					Clear_descent
+					Clear_approach
+					Handoff_to_tower
+					Clear_landing
+					Taxi_instruction ;
+
+/*-----------------------------------------------------
+	Overlapping between actors and process phases
+-----------------------------------------------------*/
+
+Passenger, Preflight  	SHARE ALL 	BoardAircraft;
+
+Passenger, Landing 		SHARE ALL 	Disembark;
+
+Pilot, Preflight 		SHARE ALL 	FlightCheck, 
+									Pushback, 
+									Taxi;
+
+Pilot, Takeoff 	  	SHARE ALL 	Liftoff;
+
+Pilot, Departure 	SHARE ALL 	ChangeFrequency;
+
+Pilot, EnRoute 	  	SHARE ALL 	OceanicExtension,
+								Follow_route, 
+								ChangeFrequency2;
+
+Pilot, Descent 	  	SHARE ALL 	Maneuver_toward_Airport;
+
+Pilot, Approach 	SHARE ALL 	Hold, 
+								Enter_approach_line;
+
+Pilot, Landing 		SHARE ALL 	Land,
+								Taxi_to_gate;
+
+Controller, Preflight 	SHARE ALL 	DepartureClearance, 
+									IssueGroundInstruction;
+
+Controller, Takeoff   	SHARE ALL 	Clear_for_takeoff, 		
+									Handoff_to_TRACon;
+
+Controller, Departure 	SHARE ALL 	IssueClearances,
+									Handoff_to_ARTCC;
+
+Controller, EnRoute   	SHARE ALL 	IssueInstruction, 
+									Handoff_to_TRACon2;
+
+Controller, Descent   	SHARE ALL 	Clear_descent;
+
+
+Controller, Approach  	SHARE ALL 	Clear_approach,
+									Handoff_to_tower;
+
+Controller, Landing 	SHARE ALL 	Clear_landing,
+									Taxi_instruction;
+
+/*---------------------------------------------------------
+	Coordination between phases 
+---------------------------------------------------------*/
+
+COORDINATE	$a: BoardAircraft 	FROM Passenger, 
+			$b: FlightCheck FROM Pilot,
+			$c: DepartureClearance FROM Controller,
+			$d: Pushback FROM Pilot,
+			$e: IssueGroundInstruction FROM Controller,
+			$f: ( Taxi | Hold ) FROM Pilot,
+			$g: Clear_for_takeoff FROM Controller,
+			$h: Liftoff FROM Pilot,
+			$i: Handoff_to_TRACon FROM Controller,
+			$j: ChangeFrequency FROM Pilot,
+			$k: IssueClearances FROM Controller
+
+	DO 	ADD $a PRECEDES $b,
+ 		    $b PRECEDES $c,
+			$c PRECEDES $d,
+			$d PRECEDES $e,
+			$e PRECEDES $f,
+			$f PRECEDES $g,
+			$g PRECEDES $h,
+			$h PRECEDES $i,
+			$i PRECEDES $j,
+			$j PRECEDES $k; OD;
+
+
+COORDINATE	$a: IssueInstruction 	FROM Controller, 
+			$b: ( OceanicExtension | Follow_route ) FROM Pilot,
+			$c: ChangeFrequency2 FROM Pilot,
+			$d: Handoff_to_TRACon2 FROM Controller,
+			$e: Clear_descent FROM Controller,
+			$f: ( Maneuver_toward_Airport | Hold ) FROM Pilot,
+			$g: Clear_approach FROM Controller,
+			$h: Enter_approach_line FROM Pilot,
+			$i: Handoff_to_tower FROM Controller,
+			$j: Clear_landing FROM Controller,
+			$k: Land FROM Pilot,
+			$l: Taxi_instruction FROM Controller,
+			$m: Taxi_to_gate FROM Pilot,
+			$n: Disembark FROM Passenger
+
+	DO 	ADD $a PRECEDES $b,
+ 		    $b PRECEDES $c,
+			$c PRECEDES $d,
+			$d PRECEDES $e,
+			$e PRECEDES $f,
+			$f PRECEDES $g,
+			$g PRECEDES $h,
+			$h PRECEDES $i,
+			$i PRECEDES $j,
+			$j PRECEDES $k,
+			$k PRECEDES $l,
+			$l PRECEDES $m,
+			$m PRECEDES $n; OD;
+
+/*
+
+ROOT Preflight_Takeoff: 	Taxi 
+							Clear_for_takeoff ;
+
+COORDINATE	$x: Taxi 	FROM Preflight, 
+			$y: Clear_for_takeoff FROM Takeoff
+	DO ADD $x PRECEDES $y; OD;
+
+ROOT Takeoff_Departure: 	Handoff_to_TRACon
+							ChangeFrequency ;
+
+COORDINATE	$x: Handoff_to_TRACon 	FROM Takeoff, 
+			$y: ChangeFrequency FROM Departure
+	DO ADD $x PRECEDES $y; OD;
+
+/* Departure and EnRoute are coordinated within Controller */
+
+/* EnRoute and Descent are coordinated within Controller */
+
+/*ROOT Descent_Approach: 		Maneuver_toward_Airport
+							[ Hold ]
+							Clear_approach ;
+
+COORDINATE	$x: Handoff_to_TRACon 	FROM Descent, 
+			$y: ChangeFrequency FROM Approach
+	DO ADD $x PRECEDES $y; OD;
+
+/* Approach and Landing are coordinated within Controller */
+ 
+/*Preflight, Preflight_Takeoff 	SHARE ALL Taxi;
+
+Preflight_Takeoff, Takeoff 		SHARE ALL Clear_for_takeoff;
+
+Takeoff, Takeoff_Departure 		SHARE ALL Handoff_to_TRACon;
+
+Takeoff_Departure, Departure 	SHARE ALL ChangeFrequency;
+
+Descent, Descent_Approach 		SHARE ALL Maneuver_toward_Airport;
+
+Descent_Approach, Approach  	SHARE ALL Hold, Clear_approach;
+