alias teach    "cd ~dropbox/www/teach"
alias B1M      "cd ~dropbox/www/teach/B1M"
alias B1B      "cd ~dropbox/www/teach/B1B"
alias B2       "cd ~dropbox/www/teach/B2"
alias B2cov    "cd ~dropbox/www/teach/B2cov"
alias AIOC     "cd ~dropbox/www/teach/AIOC"
alias B1SEM    "cd ~dropbox/www/teach/B1SEM"
