7. Nesting
Nesting means putting one thing inside another like fitting things together in some way. An object which is contained within another object is protected and makes the overall device smaller.
8. Counterweight
When a system results in an undesirable force in one direction, a counterweight is a deliberate change to balance out or improve the situation by acting in the opposite direction.
9. Prior Counteraction
When you know that an undesirable situation is going to happen, you may be able to do something ahead of when it would occur, either to prevent it from happening or to reduce the impact that might be felt when it does happen.
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