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When is it cheaper to make an international call

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idea  opinion  use  sense  
sense   opinion   use   difference  
make sense    work    matter    hurt  
to make  understand  when  have no knowledge  
from which    when    which    where  
no other country can make one like it  it is much cheaper to operate  it is more sophisticated than Landsat 7  Terra will show energy gains  
unless    when    so that    in case  
low    lower    cheaper    cheap  
make a difference  make out  make sense  make up  
when    unless    if    because  
not so better  too worse  not good as  not as good  
make up    make sure    make for    make of  
make it up    make them up    make up them    make up it.  
when    unless    if    because  
while   if   because   when  
decision    promise    sense    peace  
the which was what    what was that    which was what    that was that  
cost decreases as production rates increase  average unit cost decreases as more units are produced  materials become cheaper when they are purchased in bulk  laborers become more productive because of technological advances  
call on Monday  ask the operator to pay some money  keep waiting  phone on a Sunday