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CONSISTENT.

con·sist·ent (http://dictionary.reference.com)
–adjective
1. agreeing or accordant; compatible; not self-contradictory:
His views and actions are consistent.
2. constantly adhering to the same principles, course, form, etc.:
a consistent opponent.
3. holding firmly together; cohering.
4. Archaic . fixed; firm.

PERSISTENT

per·sist·ent (http://dictionary.reference.com)
–adjective
1. persisting, esp. in spite of opposition, obstacles, discouragement, etc.; persevering: a most annoyingly persistent young man.
2. lasting or enduring tenaciously: the persistent aroma of verbena; a persistent cough.
3. constantly repeated; continued: persistent noise.
4. Biology .
a. continuing or permanent.
b. having continuity of phylogenetic characteristics.
5. Botany . remaining attached beyond the usual time, as flowers, flower parts, or leaves.

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