Add layer/ directory to corpus

fx/layer/octest.pdf

Index: fx/layer/octest.pdf
diff --git a/fx/layer/octest.pdf b/fx/layer/octest.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..72ff9052e3efc7356da9829fc432a920140abdd4
--- /dev/null
+++ b/fx/layer/octest.pdf
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