-USING: arrays accessors assocs colors combinators grouping io
-io.streams.string io.styles kernel make math math.parser namespaces
-parser prettyprint.backend prettyprint.config prettyprint.custom
-prettyprint.sections quotations sequences sorting strings vocabs
-vocabs.prettyprint words sets generic ;
+USING: arrays accessors assocs classes colors combinators
+continuations grouping io io.streams.string io.styles kernel
+make math math.parser namespaces parser prettyprint.backend
+prettyprint.config prettyprint.custom prettyprint.sections
+quotations sequences sorting strings vocabs vocabs.prettyprint
+words sets generic ;