text: how many countries are in asia?   afghanistan  armenia  azerbaijan  bahrain  bangladesh  bhutan  brunei  burma (myanmar)  cambodia  china  cyprus  east timor  india  indonesia  iran  iraq  israel  japan  jordan  kazakhstan  korea (north)  korea (south)  kuwait  kyrgyzstan  laos  lebanon  malaysia  maldives  mongolia  nepal  oman  pakistan  philippines  qatar  russian  federation  saudi arabia  singapore  sri lanka  syria  taiwan  tajikistan  thailand  turkey  turkmenistan  united arab  emirates  uzbekistan  vietnam  yemen