Ten obligations in 三字经
the trimetrical classic (三字經) is extracted from ancient confucianism literatures, in three characters verses.

the eight verses in question are derived from 禮記　禮運


  父慈．子孝．兄良．弟弟．夫義．婦聽．長惠．幼順．君仁．臣忠十者．謂之人義


if you've some knowledge of confucianism, you can find components of 五倫 from these eight verses:


  君臣．父子．兄弟．夫妻．朋友


each one of these have two "人義"; so five of them makes ten "人義".

have fun :)