4 ክፍያን የሚመለከቱ ግንኙነቶች እና ይህ ሲከናወን በደንበኛው የተላለፉ መረጃዎች በልዩ ጥበቃ በሚደረጉ መስመሮች ላይ እና በክፍያ ወረዳዎች በተሰጡ የደህንነት ፕሮቶኮሎች በተረጋገጡ ሁሉም ዋስትናዎች ይከናወናሉ ።
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