In practice, several methods would often be combined. For example, if six extra copies of a letter were needed, the fluid-corrected original would be photocopied, but only for the two recipients getting a c.c.; the other four copies, the less-important file copies that stayed in various departments at the office, would be cheaper, hand-erased, less-distinct bond paper copies or even "flimsies" of different colors (tissue papers interleaved with black carbon paper) that were all typed as a "carbon pack" at the same time as the original.