ISSN 0021 -8251 JOURNAL FOR RESEARCH IN MATHEMATICS COUNC IL O F TEACHERS OF MATHEMATICS VOLUME 26 NUMBER 2 MARCH 1995 rh~ Journal for H~J'arrh in \fullt~matic$ duration. •n olli<tJI JOurnal of lht 'll,uJOoal Cnu11<.il nl Teacher-ol \lathe rn.tuc,," devOted to th~ tnlere<IS ol tca~hcn. of mathcrnat~<> uml nwthcmntic; c
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