Checkers

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(       
 div 
s (sa b yellow w "555pt") (table s (sa b yellow f "30pt Comic Sans MS" w "555pt" t-a "center") (tr (td "Welcome to the World of Checkers!"))) (ul s (sa f "16pt Comic Sans MS;margin-left:50pt") (li s (st1 black "solid 1pt" "5pt")(a 'href home s (sa"color:Black") "Home")) (li s (st1 red "solid 1pt" "5pt")(a 'href rule s (sa"color:red") "How to Play")) (li s (st1 black "solid 1pt" "5pt")(a 'href history s (sa"color:Black") "History")) (li s (sa b purple bd "black dashed 1pt;display:inline" p-l "3pt" p-r "3pt" f "bold 8pt New Roman;margin-left:50pt")(a 'href "http://www.cs.stolaf.edu/wiki/images/d/db/Photo_20.jpg" (span s (sa c "red") "By: Peter, Anders, and Emily"))))) (div s (sa f "12pt Comic Sans MS" c "black" p "5pt" b yellow w "545pt") (sg "Bored?") " Check out the" "classic board game: "(strong s (sa c "red") "Checkers! ") " This fun-filled pastime has been entertaining both young and old for centuries. Learn a bit about the "(a 'href history "history") " of the classic game, and then have a game of your own with the help of the " (a 'href rule "rules page.")(strong " Have fun!!!")(br) (img s"margin-left:30pt;" 'src "Check_it_Out.jpg")(img s "margin-left:50pt" 'src "Checkers.jpg") (br) (a 'href home (table (tr (mt (td (st2 "" black4 "7pt"))(td (st2 "" red4 "7pt")) 16)) (tr (mt (td (st2 "" red4 "7pt"))(td (st2 "" black4 "7pt")) 16)))) )
Help! I don't understand what to do at this step because

I could not find the meaning of the symbol s






In case it is helpful, here is the original error message from mzscheme:
reference to undefined identifier: s

 === context ===
repl-loop

reference to undefined identifier: s

 === context ===
repl-loop

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