Add pattern/ directory to the corpus

fx/pattern/2_color_type3_pattern_bbox.pdf

Index: fx/pattern/2_color_type3_pattern_bbox.pdf
diff --git a/fx/pattern/2_color_type3_pattern_bbox.pdf b/fx/pattern/2_color_type3_pattern_bbox.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..1407f63283cfee05de1529bf316f502cabcb4f9c
--- /dev/null
+++ b/fx/pattern/2_color_type3_pattern_bbox.pdf
@@ -0,0 +1,111 @@
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