Official Q&A: VEXU 2020-2021: Change Up

<VUR3c> allows "composite materials, such as G10 (Garolite), FR-4, or carbon fiber" to be used in robot construction.

"Composite material" is not further defined in the game manual or any appendices. Wikipedia defines a composite material as "a material made from two or more constituent materials with significantly different physical or chemical properties that, when combined, produce a material with characteristics different from the individual components."

Although naturally occuring, wood meets this definition - it is composed of cellulose fibers bound together by lignin. Neither cellulose nor lignin individually have similar physical properties to wood, but when combined they form a much stronger substance.

So, is wood a legal material for robot construction under <VUR3c>?

If wood is not deemed legal under <VUR3c>, what about plywood? Plywood is itself a composite material consisting of layers of wood bonded by adhesive. This bonding significantly changes the material properties of the wood (for example, the individual sheets of wood will shrink and expand in one dimension with changes in temperature and humidity, but the composite plywood will not, due to the alternating grain direction).

(Edit to add: And, since <AIR3c> is worded exactly the same as <VUR3c>, would the same answer apply to VAIC as well?)