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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)