hyperstatisme
by besseng_guy
{ } ++ = r rrr { } + = r rr { } −= r r { } { } { } { }=++ ! " #! ! # !$% & (&
by besseng_guy
{ } ++ = r rrr { } + = r rr { } −= r r { } { } { } { }=++ ! " #! ! # !$% & (&