Task 2 plpgsql done

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+-- Perl Weekly Challenge 199
+-- Task 2
+
+CREATE SCHEMA IF NOT EXISTS pwc199;
+
+CREATE OR REPLACE FUNCTION
+pwc199.task2_plpgsql( x int, y int, z int, l int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+	i int;
+	j int;
+	k int;
+	c int := 0;
+BEGIN
+	FOR i IN 1 .. array_length( l, 1 ) LOOP
+	    FOR j IN ( i + 1 ) .. array_length( l, 1 ) LOOP
+	    	FOR k IN ( j + 1 ) .. array_length( l, 1 ) LOOP
+		    IF abs( l[i] - l[j] ) <= x AND abs( l[j] - l[k] ) <= y AND abs( l[i] - l[k] ) <= z THEN
+		       c := c + 1;
+		    END IF;
+		END LOOP;
+	    END LOOP;
+	END LOOP;
+
+	RETURN c;
+END
+$CODE$
+LANGUAGE plpgsql;