"2"
"="
"X"
"S="
"S.S"
"3"
".=..S.." > .=..SR.
"..S..=." > .RS..=.
"S....S" > SR..RS
"SSR..." > SSR..R
"S....=." > S...R=R
".=....S" > R=R...S
".S...S" > RS...S
".X." > 2r2s.X.
"Sxx" > SRxSxR
"2S=" > 2sR=R