libraries -- r7rs Category scheme -- (scheme);scheme:base -- (scheme base);scheme:case-lambda -- (scheme case-lambda);scheme:char -- (scheme char);scheme:complex -- (scheme complex);scheme:cxr -- (scheme cxr);scheme:eval -- (scheme eval);scheme:file -- (scheme file);scheme:inexact -- (scheme inexact);scheme:lazy -- (scheme lazy);scheme:load -- (scheme load);scheme:process-context -- (scheme process-context);scheme:read -- (scheme read);scheme:repl -- (scheme repl);scheme:time -- (scheme time);scheme:write -- (scheme write);scheme:r5rs -- (scheme r5rs);