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Sima yera yoroshye kuyishyiramo, ikomeye cyane, kandi irwanya ikirere cyane
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Sima 52.5 y'umweru ya Portland igurishwa sima nziza ya Portland ifite ibiro 50 ihendutse muri sima ya Portland
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Seti y'imashini yihuta cyane ya sima 52.5 y'umweru yo gushyiraho amatafari yumye
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Sima yera ifite imikorere myiza cyane ku bikoresho byakoreshejwe mbere
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Gushyiraho vuba vuba Seti y'umweru ya sima yo gukoresha mu matafari yumye
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Sima y'umweru ya Portland ifite imbaraga nyinshi – Idapfa amazi ku matafari no ku nyubako
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Sima y'umweru idapfa amazi 52.5 – Uburyo bwihuse bwo kuvugurura ubwiherero no gushyiramo amatafari yo hasi
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Sima y'umweru ifite ubwiza bwa 52.5 ku matafari - Ifite amazi kandi isuku cyane ku mishinga y'ubwubatsi
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Umukora Igiciro Gihendutse Ubwiza Buhanitse 32.5 42.5 52.5 Sima Yera ya Portland
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Sima y'umweru 52.5 ikora vuba, yo gusana byihutirwa/kubaka ahantu hato
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Simenti y'umweru ya Portland 52.5 Simenti ya silicate ituruka mu Bushinwa
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Sima y'umweru ifite ubwiza bwo hejuru ya 425 mpa Sima y'umweru ya 325 mpa 525 Sima y'umweru ya Portland Sima ya silicate