החיפוש שביצעת - information concentration problems functions ((mdf fibre) or (efb fibre)) - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
information concentration » information convention, information orientation, formation preconcentration
concentration problems » concentration profiles, configuration problems, concentration from
problems functions » problems fiction, process functions, problems directions
mdf fibre » made fibre, opf fibre, mat fibre
efb fibre » efb fibres, opefb fibre, efb fibers

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