diff --git a/td/td1.pdf b/td/td1.pdf new file mode 100644 index 0000000000000000000000000000000000000000..c87180bd8462382dc9e8c6355b4f49187a075373 Binary files /dev/null and b/td/td1.pdf differ diff --git a/td/td2.pdf b/td/td2.pdf new file mode 100644 index 0000000000000000000000000000000000000000..12dbbf3498f871ff2de430cda6f04ac4b495ec5d Binary files /dev/null and b/td/td2.pdf differ diff --git a/td/td3.pdf b/td/td3.pdf new file mode 100644 index 0000000000000000000000000000000000000000..fa2f9ad21753b5e9e5cdb6616f089fbcd3866da6 Binary files /dev/null and b/td/td3.pdf differ diff --git a/td/td4.pdf b/td/td4.pdf new file mode 100644 index 0000000000000000000000000000000000000000..52755df4c85070ea5ed553cadb4b56dca8fd6808 Binary files /dev/null and b/td/td4.pdf differ