P3R1I1M3E1R1S1
11 points
PRIMERS is validvalid
PRIMER, a book that covers the basics of a subject [n]
PRIMER, a book that covers the basics of a subject, also PRIMMER [n]
PRIMER, a book that covers the basics of a subject [n]
PRIMER, a book that covers the basics of a subject, also PRIMMER [n]