local co = coroutine.create(function(a,b,c)
print("co:",a,b,c)
end)
coroutine.resume(co,1,2,3)
co = coroutine.create(function(a,b)
print("co:",coroutine.yield(a+b,a-b))
end)
print(coroutine.resume(co,20,10))
co = coroutine.create(function( )
print("co:",coroutine.yield( ))
end)
coroutine.resume(co)
coroutine.resume(co,4, 5)
co = coroutine.create(function( )
return 6,7
end)
print(coroutine.resume(co))
