div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=lesson-4-a-step-on-the-keyboard-goes-from-one-white-key-to-htmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: LESSON 4 A step on the keyboard goes from one white key to loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentsmxreader031viewer202202070161f7489e53663328a2390f50html5thumbnails1jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=2Page 2button div class=ts-imageimg data-url=lesson-4-a-step-on-the-keyboard-goes-from-one-white-key-to-htmlpage=2 data-page=2 class=ts-thumb lazyload alt=Page 2: LESSON 4 A step on the keyboard goes from one white key to loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentsmxreader031viewer202202070161f7489e53663328a2390f50html5thumbnails2jpg width=140 height=200 divdiv