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diff --git a/files/practicum/support.icl b/files/practicum/support.icl
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+implementation module support
+
+import StdEnv, StdIO
+	
+toPoint2				:: Size Pos -> Point2
+toPoint2 {w,h} {rx,ry}	= {x=toInt ((toReal w)*rx),y=toInt ((toReal h)*ry)}
+
+fromPoint2				:: Size Point2 -> Pos
+fromPoint2 {w,h} {x,y}	= {rx=(toReal x)/(toReal w),ry=(toReal y)/(toReal h)}
+
+circle	 				:: Int -> Oval
+circle r				= {oval_rx=r,oval_ry=r}
+
+instance zero Pos where
+	zero				= {rx=zero,ry=zero}
+instance zero Vel where
+	zero				= {v0=zero,v1=zero}
+instance + Pos where
+	(+) p1 p2			= {rx=p1.rx+p2.rx,ry=p1.ry+p2.ry}
+instance - Pos where
+	(-) p1 p2			= {rx=p1.rx-p2.rx,ry=p1.ry-p2.ry}
+instance + Vel where
+	(+) a b				= {v0=a.v0+b.v0,v1=a.v1+b.v1}
+instance - Vel where
+	(-) a b				= {v0=a.v0-b.v0,v1=a.v1-b.v1}
+
+class scale a			:: !Real !a -> a
+
+instance scale Pos where
+	scale r p			= {rx=r*p.rx,ry=r*p.ry}
+instance scale Vel where
+	scale r v			= {v0=r*v.v0,v1=r*v.v1}
+
+class toVel a			:: !a -> Vel
+
+instance toVel Pos where
+	toVel p				= {v0=p.rx,v1=p.ry}
+
+class dist a			:: !a !a -> Real
+
+instance dist Pos where
+	dist p1 p2		= sqrt ((p1.rx - p2.rx)^2.0 + (p1.ry - p2.ry)^2.0)
+instance dist Real where
+	dist r1 r2		= abs (r1 - r2)
+
+movePos				:: Vel Pos -> Pos
+movePos v p			= {p & rx=p.rx+v.v0,ry=p.ry+v.v1}