| Invited Grades | GC-4 and above |
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| Invited Grades | ጠቅላላ የውሃ የግንባታ ስራዎች ተቋራጭ ደረጃ 6 /ደረጃ ስድስት/እና በላይ |
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| Invited Grades | WWGC-5/WWC-5 እና ከዚያ በላይ |
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| Invited Grades | WWC Grade 5 or WWC Grade 6 & GC Grade 5 & above |
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| Invited Grades | WWC-3 & above |
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| Invited Grades | WWC-6, GC-6, and above |
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| Invited Grades | ለጠቅላላ ዉሃ ስራ ተቋራጭ ደረጃ 6 እና ከዚያም በላይ |
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| Invited Grades | ደረጃ 7 እና በላይ ጠቅላላ ስራ ተቋራጭ |
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| Invited Grades | category 5 and above Water Works Contractor |
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| Invited Grades | WWC-5 or WWC & GC-5 and above |
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| Invited Grades | WWC Grade 5 or WWC Grade 6 & GC Grade 5 &above |
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| Invited Grades | (WWC- grade 7) and above |
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| Invited Grades | ደረጃ 5/አምስት እና ከዚያ በላይ ጠቅላላ ውሀ ነክ ስራ ተቋራጭ |
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