update pattern

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update pattern

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Last edited Feb 29, 2020

Created on Feb 29, 2020

Clicking Random generates a new alphabet subset, and the visualization demonstrates D3’s enter, update, and exit pattern. Letters slide vertically and horizontally via `d3.transition` while changing fill-opacity; entering letters appear green from above, exiting ones drop below in brown, and updates shift to new positions in dark gray. The code uses `d3.selectAll` with key functions for data joining, and renders animated SVG text elements.

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