Try these links. I think you can order your sequence from any of them http://alvinalexander.com/scala/how-sort-scala-sequences-seq-list-array-buffer-vector-ordering-ordered; http://www.addgene.org/empty-backbones/?gclid=CjwKEAjw86e4BRCnzuWGlpjLoUcSJACaHG55E6zVU4vF4Sp3C_gIXG-U54vVh4a4rvZeqVXX3kGFHRoCr6zw_wcB