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There are nine image-names which define the control- and guide-symbols to draw the tree. Here is the list of the allowed image-names and the related corresponding ascii-symbols:

A tree will be build-up with these elements like follows:

   [-] node-with-subnodes      (open)
    |-[+] not-empty-subnode1   (guide+handle+close)
    |-[x] empty-subnode        (guide+handle+empty)
    `-[-] not-empty-subnode2   (end-guide+handle+open)
       |-* leaf-1              (no-guide+no-handle+guide+handle+leaf)
       `-* leaf-2              (no-guide+no-handle+end-guide+handle+leaf)