Get first word of all strings in lists

Question

I have a CSV file which I\'m reading in like below. I need to get the first word of all the strings. I know how to get first letter but I\'m not sure how I can get words.

Answer 1

l = [
    ['diffuse systemic sclerosis', 'back', 'public on july 15 2008'],
    ['diffuse systemic sclerosis', 'forearm', 'public on may 9 2014']
    ]
d = lambda o: [a.split().pop(0) for a in o]
r = lambda a,b: d(a) + d(b)
print "\n".join(set(reduce(r, l)))
>>> 
public
forearm
diffuse
back