Laboratories for Information Technology, 21 Heng Mui Keng Terrace, Singapore 119613. skng@lit.org.sg|Laboratories for Information Technology, 21 Heng Mui Keng Terrace, Singapore 119613. skng@lit.org.sg|Laboratories for Information Technology, 21 Heng Mui Keng Terrace, Singapore 119613. skng@lit.org.sg