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By making it work in such environments as deserts, oceans or space. By working hard for 10 or 20 years. By either properly programming it or changing its structure. By reproduce it.
have discovered have invented pointed out have revealed
By making it work in such environments as deserts, oceans or space. By working hard for 10 or 20 years. By either properly programming it or changing its structure. By reproducing it.
by mistake by accident by ourselves by the way
experience had experienced experienced have experienced
found had found would find would have found
However In view of this Consequently Furthermore
in; for in; in for; for for; in
to; at in; at with; for on; for
we realize; have we to do we realized; we have to we realize; we have to do we realize; have we to
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