diff --git a/d19.sh b/d19.sh
new file mode 100755
index 0000000..f8c83ca
--- /dev/null
+++ b/d19.sh
@@ -0,0 +1,34 @@
+#!/bin/sh
+tmp="$(mktemp -d)"
+trap "rm -rf '$tmp'" EXIT
+set -ex
+
+cat "$1" | tr '\n' - | sed -e 's/--.*//' | tr - '\n' | tr '"' \' | sed -e 's/[0-9]\+/_&/g' -e 's/$/;/' > "$tmp/r"
+cat "$1" | tr '\n' - | sed -e 's/.*--//' | tr - '\n' > "$tmp/m"
+
+cat > "$tmp/run.y" << EOF
+%code top {
+#include <stdio.h>
+int yylex() { return getchar(); }
+void yyerror() {}
+int count = 0;
+}
+%glr-parser
+%%
+input: %empty | input line;
+line: '\n' | _0 '\n' { count++; } | error '\n' { yyerrok; };
+$(cat "$tmp/r")
+%%
+int main()
+{
+    yyparse();
+    printf("%d\n", count);
+}
+EOF
+#cat "$tmp/run.y"
+#cat "$tmp/m"
+sed -e '/^_8:/c_8: _42 | _42 _8;' -e '/^_11:/c_11: _42 _31 | _42 _11 _31;' "$tmp/run.y" > "$tmp/run2.y"
+bison -o /dev/stdout "$tmp/run.y" | cc -o "$tmp/run" -xc -
+bison -o /dev/stdout "$tmp/run2.y" | cc -o "$tmp/run2" -xc -
+cat "$tmp/m" | "$tmp/run"
+cat "$tmp/m" | "$tmp/run2"