DOC: document relations between internal entities
Links between internal structures have been represented in
entities.fig. The pdf and svg versions were added too.
diff --git a/doc/internals/entities.fig b/doc/internals/entities.fig
new file mode 100644
index 0000000..9e59ea3
--- /dev/null
+++ b/doc/internals/entities.fig
@@ -0,0 +1,161 @@
+#FIG 3.2
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diff --git a/doc/internals/entities.pdf b/doc/internals/entities.pdf
new file mode 100644
index 0000000..2252ffa
--- /dev/null
+++ b/doc/internals/entities.pdf
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