// s ::= () => s0
//}
+//tibcase {
+// input "
+// hello
+// there
+// how
+// { are }
+//";
+//
+// s ::= ws S ws
+// ws !::= w*
+// S ::= { Hello }
+// Hello ::= "hello" { "there" "how" { "are" } }
+//}
+
testcase {
input "ab c";
output "1:{{a b} {c}}";