diff --git a/module4/src_R_challenger_VFC.pdf b/module4/src_R_challenger_VFC.pdf new file mode 100644 index 0000000000000000000000000000000000000000..3b09a8caf296e54ceb7da19a1e96ed33131eeb8a Binary files /dev/null and b/module4/src_R_challenger_VFC.pdf differ