[NTG-context] How to display these characters

Dear all, I have this: \starttext \starttyping foo └── bar ├── baz │   └── index.html └── index.html \stoptyping \stoptext The source code is generated with the linux command "tree". The special characters which indicate the folder depth are not displayed. I guess that I could define a fallbackfont. Do anyone know the unicode range that should be covered and the font that has these characters? TIA juh