2008/04/25 17:06:26 khong 1.1.2.3: i55063, make period a sentence delimiter
2008/04/25 06:40:50 khong 1.1.2.2: i55063, make space as Thai sentence delimiter
2008/04/24 03:19:10 khong 1.1.2.1: i55063, set Thai letters as sentence delimiter for Thai and English mixed text