日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

>>510
Seems like it, so thanks!
And with that, another question. Wi and We.
ゐ ゑ ヰ ヱ
In none of my few textbooks i was able to find these kanas.
I'yet to see any sentence with these in use.
So, what about them? Are they so rare, or obsolete? Is there a point in using them?
I theoretically could memorize them them, as learning them would take just a few minutes for me, but i just have this feeling they just are not in usage anymore.