"The printing press boosted the power of ideas to copy themselves. Prior to low-cost printing, ideas could and did spread by word of mouth. While this was tremendously powerful, it limited the complexity of the ideas that could be propagated to those that a single person could remember."
Q. Is the "those" proper here? If so, what does it indicate?
The printing press boosted the power of ideas to copy themselves. Prior to low-cost printing, ideas could and did spread by word of mouth. " Q.
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The printing press boosted the power of ideas to copy themselves. Prior to low-cost printing, ideas could and did spread by word of mouth. While this was tremendously powerful, it limited the complexity of the ideas that could be propagated to those ideas that a single person could remember."
Q. Is the "those" proper here? If so, what does it indicate? thos