screwlisp<p><a href="https://gamerplus.org/tags/commonLisp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>commonLisp</span></a> <a href="https://gamerplus.org/tags/programming" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>programming</span></a> <a href="https://gamerplus.org/tags/lazy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>lazy</span></a> <a href="https://gamerplus.org/tags/efficient" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>efficient</span></a> <a href="https://gamerplus.org/tags/typed" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>typed</span></a> <a href="https://gamerplus.org/tags/tree" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>tree</span></a> fringe <a href="https://gamerplus.org/tags/traversal" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>traversal</span></a> with the <a href="https://gamerplus.org/tags/series" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>series</span></a> Macro package <a href="https://gamerplus.org/tags/intro" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>intro</span></a> <a href="https://screwlisp.small-web.org/cl-series/leaves-of-a-tree/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">screwlisp.small-web.org/cl-ser</span><span class="invisible">ies/leaves-of-a-tree/</span></a></p><p>Just a quick note for this morning.</p><p>We make something like:<br>```<br>* '((1 (2)) (3 (4 (5) 6)) (7) 8)<br>((1 (2)) (3 (4 (5) 6)) (7) 8)<br>* (pick-len-leaves-less-than * 5 6)<br>(1 2 3 4 5)<br>* (reverse **)<br>(8 (7) (3 (4 (5) 6)) (1 (2)))<br>* (pick-len-leaves-less-than * 5 6)<br>(3 4 5 1 2)<br>```</p>