All of the above mentioned points show the difference between formal and informal writing and when to use which depends on the purpose of the writing. Business communications and academic papers need formal writing and all letters or communications to friends and close family can be in informal writing.
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The first modern comic books under the Marvel Comics brand were the science-fiction anthology Journey into Mystery #69 and the teen-humor title Patsy Walker #95 (both cover dated June 1961), which each displayed an MC box on its cover.