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Steel Radial Speed Rating
stuck between a rock and a hard place
S and P aren't grades, they're mint marks indicating where a coin was struck. There are many other possible mint marks for U.S. coins as well, depending on their denomination and date.
s-t=2(iw)=p. There you go
A frequency is when a number occurs the most like m i s s i s s i p p i m1 i 4 s 4 p2 i is the frequency