Read the excerpt from chapter 7 of Obasan by Joy Kogawa. There have been a few others. So counting that last fast visit, there have been nine trips in all. And in between visits, there’s the army, the navy, the air force of letters—all the Aunt Emily correspondence jamming up our small metal box in the Granton PO. What is the effect of using the phrases "the army, the navy, the air force of letters” and "jamming up” to describe Aunt Emily’s correspondence?