Retaining wall systems for civil engineering, namely, retaining walls and blocks not of metal for earth retention

'block':11 'civil':5 'earth':16 'engin':6 'metal':14 'name':7 'retain':1,8 'retent':17 'system':3 'wall':2,9

Design of civil engineering structures, namely, retaining walls for earth retention

'civil':3 'design':1 'earth':10 'engin':4 'name':6 'retain':7 'retent':11 'structur':5 'wall':8

Construction of civil engineering structures, namely, retaining walls for earth retention

'civil':3 'construct':1 'earth':10 'engin':4 'name':6 'retain':7 'retent':11 'structur':5 'wall':8

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