Deleted f22/andy_lec_notes/lec04_Sep14_VarsExprs/lec04_vars_exprs_template.ipynb, f22/andy_lec_notes/lec04_Sep14_VarsExprs/lec04_vars_exprs_completed.ipynb

Update f22/andy_lec_notes/lec04_Sep14_VarsExprs/.ipynb_checkpoints/lec04_vars_exprs_850-checkpoint.ipynb, f22/andy_lec_notes/lec04_Sep14_VarsExprs/.ipynb_checkpoints/lec04_vars_exprs_template-checkpoint.ipynb, f22/andy_lec_notes/lec04_Sep14_VarsExprs/.ipynb_checkpoints/lec_04_850-checkpoint.ipynb, f22/andy_lec_notes/lec04_Sep14_VarsExprs/lec04_vars_exprs_completed.ipynb, f22/andy_lec_notes/lec04_Sep14_VarsExprs/lec04_vars_exprs_template.ipynb, f22/andy_lec_notes/lec04_Sep14_VarsExprs/readme.md