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F2..., it involves a system comprising at least two separately anchored lines, of which one (“the working line”) is used as a means of access, egress and support and the other is the safety line;

the user is provided with a suitable harness and is connected by it to the working line and the safety line;

the working line is equipped with safe means of ascent and descent and has a self-locking system to prevent the user falling should he lose control of his movements; and

the safety line is equipped with a mobile fall protection system which is connected to and travels with the user of the system.