The idea is that the construction and labour relations associations which are employer groups located in every province will meet with the building and construction unions and also with the non-union contractor associations in each province and try to find a consensus on a range of fair wages for every trade.
non-union contractor associations  are also building and construction unions.
You can't be union & non-union at the same time.
( z1 union :mod ( z2 build ) :mod ( z3 construct ) :mod ( z4 also ) :domain ( z5 association :mod ( z6 company :ARG0-of ( z7 contract ) :mod ( z8 union :polarity - ) ) ) )