@@ -143,7 +143,7 @@ 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
146−A picture might help::
146+A picture might help:
@@ -152,7 +152,7 @@ A picture might help::
157The syntax for a fragment of the subject at a tree address, or
157The syntax for a fragment of the subject at a tree address, or
158*axis*, is just `+axis`. So:
158*axis*, is just `+axis`. So:
@@ -219,7 +219,7 @@ table here -- just a tree search.
220An expression like the label `x` or the axis `+2`, which
220An expression like the label `x` or the axis `+2`, which
221designates a fragment or feature of the subject, is called a
221designates a fragment or feature of the subject, is called a
222−*limb*. A list of limbs connected with `.`, is a *wing*.
222+*limb*. A list of limbs connected with `.` is a *wing*.
224To remind you that you're not in Kansas anymore, the syntax for a
224To remind you that you're not in Kansas anymore, the syntax for a
225wing, like `q.y` above, means means "q inside y." In a classic
225wing, like `q.y` above, means means "q inside y." In a classic