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There are 4 different meanings of Invalid.
Disability
9 products, approx. 35 pages
A person with a disability Validity
7 products, approx. 16 pages
Validity, in logic, true premises cannot lead to a false conclusion Validity (statistics)
2 products, approx. 6 pages
Validity (statistics), a measure which is measuring what it is supposed to measure Patient
3 products, approx. 2 pages
Patient, a sick person 
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