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diff --git a/course/semester2/pprog/assignment1/single-thread/nbody.h b/course/semester2/pprog/assignment1/single-thread/nbody.h
index a9bfec44..2ff81d7b 100644
--- a/course/semester2/pprog/assignment1/single-thread/nbody.h
+++ b/course/semester2/pprog/assignment1/single-thread/nbody.h
@@ -105,18 +105,22 @@ typedef struct
 	int verbosity; // print statistics every number of steps indicated by this variable
 	clock_t start_clock;  // clock cycles done when simulation starts
 	struct timeval start_time; // time at which simulation starts
+	float theta; // Parameter used for Barns Hut algorithm
+	int random; //Used to randomly create bodies
 } Options;
 
 void Body_Print(Body * a, FILE * out); //Print body a
-void Body_Force(Body * a, System * s); //Compute force on body a due to system of bodies s
+void Body_Forces(Body * a, System * s); //Compute force on body a due to system of bodies s
+void Body_Force(Body * a, Body * b); // Compute force on body a due to body b
 void Body_Velocity(Body * a); //Compute velocity of body a
 void Body_Position(Body * a); //Compute position of body a
 
 void System_Init(System * s, const char * fileName); //Initialise System (array of bodies) from a text file
+void System_Random(System * s, int r); //Randomly create bodies
 void System_Compute(System * s);
 void System_Forces(System * s1, System * s2); //Compute forces for bodies in s1 due to bodies in s2 (also updates velocities)
 void System_Positions(System * s); //Update positions for bodies in s1
-
+System * Split_System(System * s, unsigned n); // Splits one system into a number of other systems, returns an array of size n
 
 void Universe_Cleanup(); //Cleanup universe and write bodies to file