(subsection
:title [third and fourth hole and screw]))
(section
- :title [battery packs])
+ :title [battery packs]
+ (subsection
+ :title [leads])
+ (subsection
+ :title [deck attachment]))
(section
- :title [motors])
+ :title [motors]
+ (subsection
+ :title [leads])
+ (subsection
+ :title [mount])
+ (subsection
+ :title [deck attachment]))
(section
- :title [wheels])
+ :title [wheels]
+ (subsection
+ :title [tread])
+ (subsection
+ :title [motor]))
(section
- :title [caster])
+ :title [caster]
+ (subsection
+ :title [deck placement]))
(section
:title [sonars]))
(chapter