Show that there are no values of t such that 
and 
are parallel. Show your work. 
Definitions:
Symptoms
Physical or mental features that are regarded as indicating a condition or disease.
Token Economy
A behavior modification method that uses tokens as rewards for desired behaviors, which can be exchanged for privileges or goods.
Reinforcers
Stimuli that increase the likelihood of a behavior being repeated.
Tokens
Symbols or objects used to represent or signify something else, or in behavioral economics, a tangible reward used in token economy systems for reinforcing desired behaviors.
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