1. Review the exercises and try to create your own implementation
of each of them.

2. Explain when you would use each of 
ej, ij, and lj.
Hint: see https://code.kx.com/trac/wiki/Reference/joins
	home4_2

3. Find the volume weighted average of each stock's trade
in the one minute interval preceding some given time t.
Use rantrade of size 100,000, but set it up so that the times
spread out over a 10 minute interval.
	home4_3.q

4. Are there any operations you can do with regular tables that you
cannot do with splay tables?
	home4_4

5.  
Call an "anti-bundle" in a stock a consecutive series of trades 
of length at least 2 where the price
decreases or stays the same with each trade.
(Example: if price is 1 2 3 4 2 3 4 5  4 3 2 1 1 1 2 3
then the anti-bundles will be 4 2, 5 4 3 2 1 1 1.)
Find the weighted average price per anti-bundle per stock.
	q antibundle.q

