own statements class for mom

so we don’t have to deal with arrays (as a special case)
and use method sending as is good oo

lib/vool/statements/statements.rb

@@ -1,33 +1,13 @@
 module Vool
   class Statements < Statement
-    attr_reader :statements
-    def initialize(statements)
-      @statements = statements
-    end
+    include Common::Statements
 
     # create machine instructions
     def to_mom( method )
-      @statements.collect do |statement|
+      all = @statements.collect do |statement|
         statement.to_mom( method )
       end
-    end
-
-    def empty?
-      @statements.empty?
-    end
-    def single?
-      @statements.length == 1
-    end
-    def first
-      @statements.first
-    end
-    def length
-      @statements.length
-    end
-
-    def collect(arr)
-      @statements.each { |s| s.collect(arr) }
-      super
+      Mom::Statements.new(all)
     end
 
     def create_objects