真心求教，如何删除重复项。

比如a表单有betchawin
bgbattle
bihshop
binbahyan
bitrasoft
bitzones
bizekatil
bjabd
bjdab
bjdyc
bloomedia
blznz
bmarkers
bonpole
boozcamp
bouamou
bridecash
brillanz
brunarios
bulvarinn
butest
buyisofa
buzzcops
huemn
hwnar
hyeoptics
b表单有
bjdab
bjdyc
bloomedia
blznz
bmarkers
bonpole
boozcamp
bouamou
bridecash
brillanz
brunarios
bulvarinn
butest
buyisofa
buzzcops
huemn
hwnar
hyeoptics
如何提取两表不重复的，最后得到
betchawin
bgbattle
bihshop
binbahyan
bitrasoft
bitzones
bizekatil
bjabd