▁children ▁att ending ▁smaller , ▁special ized ▁classes . ▁ ▁In ▁the ▁municipality ▁there ▁were ▁ 3 1 ▁students ▁in ▁primary ▁school . ▁ ▁The ▁secondary ▁school ▁program ▁consists ▁of ▁three ▁lower , ▁oblig atory ▁years ▁of ▁school ing , ▁followed ▁by ▁three ▁to ▁five ▁years ▁of ▁optional , ▁advanced ▁schools . ▁ ▁All ▁the ▁lower ▁secondary ▁students ▁from ▁Gr ind el ▁attend ▁their ▁school ▁in ▁a ▁neighbor ing ▁municipality . ▁ ▁, ▁there ▁were ▁ 5 7 ▁students ▁from ▁Gr ind el ▁who ▁attended ▁schools ▁outside ▁the ▁municipality . ▁ ▁References ▁ ▁External ▁links ▁▁▁▁ ▁Category : M unicip al ities ▁of ▁the ▁canton ▁of ▁Sol oth urn <0x0A> </s> ▁Clark ston ▁( , ▁) ▁is ▁a ▁sub urban ▁town ▁in ▁East ▁Ren f rew shire , ▁in ▁the ▁Central ▁Low lands ▁of ▁Scotland . ▁A ▁d orm itory ▁town ▁with ▁a ▁population ▁of ▁around ▁ 2 0 , 0 0 0 , ▁Clark ston ▁is ▁on ▁the ▁southern ▁fr inge ▁of ▁the ▁Gre ater ▁Glasgow ▁con urb ation ▁and ▁directly ▁ad jo ins ▁the ▁neighbour ing ▁sub urban ▁villages ▁of ▁Bus by ▁and ▁Nether lee , ▁as ▁well ▁as ▁the ▁towns ▁of ▁Newton ▁M ear ns ▁and ▁G iff no ck . ▁ ▁On ▁ 2 1 ▁October ▁ 1 9 7 1 , ▁the ▁main ▁sho pping ▁building ▁was ▁the ▁scene ▁of ▁the ▁Clark ston ▁explos ion , ▁which ▁killed ▁ 2 2 ▁people ▁and ▁injured ▁around ▁ 1 0 0 . ▁A ▁pla que ▁on ▁the ▁site ▁comm emor