▁on ▁October   1 , ▁ 1 9 8 1 . ▁The ▁official ▁hol iday ▁of ▁Ro za ▁is ▁observed ▁on ▁the ▁last ▁Sunday ▁of ▁August . ▁ ▁References ▁ ▁Category : U r ban - type ▁settlement s ▁in ▁Ch ely ab in sk ▁O blast <0x0A> </s> ▁I wan ▁Mart ua ▁Lok ot ▁D ong an ▁Sim at up ang , ▁more ▁commonly ▁known ▁as ▁I wan ▁Sim at up ang ▁( 1 8 ▁January ▁ 1 9 2 8 ▁in ▁Sib ol ga , ▁North ▁Sum atra ▁– ▁ 4 ▁August ▁ 1 9 7 0 ▁in ▁Jak arta , ▁Indones ia ) ▁was ▁an ▁Indones ian ▁novel ist , ▁poet ▁and ▁ess ay ist . ▁ ▁Life ▁and ▁works ▁He ▁joined ▁the ▁ ▁( T RI P ), ▁becoming ▁a ▁Commander , ▁and ▁was ▁captured ▁in ▁North ▁Sum atra ▁during ▁Operation ▁Kra ai , ▁against ▁the ▁Republic ▁of ▁Indones ia ' s ▁temporary ▁capital ▁in ▁Y ogy ak arta ▁( 1 9 4 8 / 4 9 ). ▁After ▁he ▁was ▁released , ▁he ▁graduated ▁from ▁high ▁school ▁in ▁Med an . ▁He ▁studied ▁medicine ▁at ▁the ▁ ▁in ▁Sur ab aya ▁but ▁did ▁not ▁gradu ate . ▁He ▁then ▁went ▁to ▁the ▁Netherlands ▁and ▁studied ▁anth rop ology ▁at ▁the ▁University ▁of ▁Le iden ▁from ▁ 1 9 5 4 ▁to ▁ 1 9 5 6 , ▁followed ▁by ▁the ▁Full ▁Cour se ▁of ▁the ▁International ▁Institute ▁of ▁Social ▁Studies ▁at ▁The ▁H ague , ▁ 1 9