@@ -143,6 +143,8 @@ which is its address. The root of the tree is `1`; if the
143address of a cell is `n`, its head is `2n` and its tail is
143address of a cell is `n`, its head is `2n` and its tail is
146A picture might help:
148A picture might help:
@@ -417,7 +419,7 @@ Finally, let's use this thing:
417 {@rs @ud}
419 {@rs @ud}
418[.6.28 42]
420[.6.28 42]