I used the last page on the back cover of the pattern "Lisbon from the other bank III" to fine tune the lines of the poscas. It started off by unloading a dot of ink and always scratching it relieving the force on the pen. When the line has the desired intensity or thickness, the line in the drawing that is in progress on another page. And the game results in a firework display that works well in one of the exercises that Richard is doing in this online session of LxOM. And since fireworks are not yet prohibited from being made on paper, it must be done in other ways.
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