Change the order of the lab assignments

labs/l1/NLP-L1.ipynb

labs/l1x/NLP-L1X.pdf

labs/l2/NLP-L2.ipynb

labs/l2x/NLP-L2X.pdf

labs/l3/NLP-L3.ipynb

labs/l3/decoder.svg

labs/l3/train-de.txt

labs/l3/train-en.txt

labs/l3/valid-de.txt

labs/l3/valid-en.txt

labs/l3x/NLP-L3X.ipynb

labs/l3x/snli_1.0_test_preprocessed.txt

labs/l3x/snli_1.0_train_preprocessed.txt

labs/l4/NLP-L4.ipynb

labs/l4/dev.txt

labs/l4/glove.pt

labs/l4/train.txt

labs/l4x/NLP-L4X.ipynb

labs/l4x/dev.txt

labs/l4x/test-notags.txt