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You can prepend or append text to a selection using visual blockmode in combination with I and A.
Visual blockmode is envoked when you press ctrl-v. You can use any motion command (/,f,F,t,T,gg,G,h,j,k,l, etc.) to expand the selection. Pressing I will allow you to insert text at the beginning of each selected line. Note: only the first line will visually update until you press <esc>
Pressing gv will reselect the last selection. $ will move the selection to the end the line. Then A will append text at the end of each line similar to how I works.