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if (e.keyCode == 123) { // F12
if (e.ctrlKey && e.shiftKey && e.keyCode == 73) { // Ctrl+Shift+I
if (e.ctrlKey && e.shiftKey && e.keyCode == 74) { // Ctrl+Shift+J
if (e.ctrlKey && e.keyCode == 85) { // Ctrl+U
if (e.ctrlKey && e.keyCode == 67) { // Ctrl+C