>254V=:0  287=0G0T  @50:FVN  2V9AL:  =0  2>@>3V2  C  WE=V9  7>=V  < l i n k = " t o p i c : l i n e   o f   s i g h t " > >3;O4C< / l i n k > .   A=CNBL  B@8  2848  ?>254V=:8: 
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 3@5A82=0:   20HV  2>W=8  ?5@5A;V4C20B8<CBL  V  0B0:C20B8<CBL  1C4L- O:>3>  2>@>30  2  <560E  A2>3>  < l i n k = " t o p i c : l i n e   o f   s i g h t " > >3;O4C< / l i n k > . 
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 0E8A=0:   20HV  2>W=8  404CBL  2V4AVG  2>@>3C,   I>  ?>B@0?82  C  WE=N  7>=C  < l i n k = " t o p i c : l i n e   o f   s i g h t " > >3;O4C< / l i n k > ,   ?@>B5  =5  2V4E>48B8<CBL  40;5:>  2V4  A2>TW  ?>78FVW. 
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 0A82=0:   20HV  2>W=8  =V  2V4ABC?0B8<CBL,   =V  =0?040B8<CBL. 
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 "8?  ?>254V=:8  <>65  1CB8  ?@87=0G5=89  O:  >:@5<8<  2>W=0<,   B0:  V  3@C?0<. 