diff --git a/trunk/ripnews/set/intspan.rb b/trunk/ripnews/set/intspan.rb
index 155ecf5..387c2a0 100644
--- a/trunk/ripnews/set/intspan.rb
+++ b/trunk/ripnews/set/intspan.rb
@@ -309,8 +309,8 @@ def union(set_spec)
 		end
 	end
 
-	iA < eA.length and (! inB) and  eS.push(eA[iA..eA.length])
-	iB < eB.length and (! inA) and  eS.push(eB[iB..eB.length])
+	iA < eA.length and (! inB) and  eS += eA[iA..eA.length]
+	iB < eB.length and (! inA) and  eS += eB[iB..eB.length]
 
 	s.set_pos_inf(@set["posInf"] || b.pos_inf)
 	s.set_edges(eS)
@@ -355,8 +355,8 @@ def intersect(set_spec)
 		end
 	end
 
-	iA < eA.length and inB and eS.push(eA[iA..eA.length])
-	iB < eB.length and inA and eS.push(eB[iB..eB.length])
+	iA < eA.length and inB and eS += eA[iA..eA.length]
+	iB < eB.length and inA and eS += eB[iB..eB.length]
 
 	s.set_neg_inf(@set["posInf"] && b.pos_inf)
 	s.set_edges(eS)
@@ -400,8 +400,8 @@ def diff (set_spec)
 		end
 	end
 
-	iA < eA.length and not inB and eS.push(eA[iA..eA.length])
-	iB < eB.length and     inA and eS.push(eB[iB..eB.length])
+	iA < eA.length and not inB and eS += eA[iA..eA.length]
+	iB < eB.length and     inA and eS += eB[iB..eB.length]
 
 	s.set_edges(eS)
 
@@ -438,8 +438,8 @@ def xor(set_spec)
 		end
 	end
 
-	iA < eA.length and eS.push(eA[iA..eA.length])
-	iB < eB.length and eS.push(eB[iB..eB.length])
+	iA < eA.length and eS += eA[iA..eA.length]
+	iB < eB.length and eS += eB[iB..eB.length]
 
 	s.set_pos_inf(@set["posInf"] ^ b.pos_inf)
 	s.set_edges(eS)
@@ -637,7 +637,7 @@ def insert(n)
 		upper = edge[i...edge.length]
 		edge = lower
 		edge.push(n-1, n)
-		edge.push(upper)
+		edge += upper
 	elsif (not lGap and rGap)
 		edge[i-1] += 1
 	elsif ( lGap and not rGap)