Chows cannot be melded by discards, only pongs and kongs. Player A has two Dragon Pongs or Kongs exposed. Wildcard tiles cannot replace tiles in Pongs and Kongs. This includes the 13 orphans, 4 concealed pongs, heavenly hand and earthly hand. The Shans or Pongs called the area Cassay, the Burmese Kathe, and the Assamese Meklee.