Python solution follows (earlier one with an error cancelled). All
crossposting removed since crossposting is a standard trolling tactic.
from collections import defaultdict
def collect(xss):
d = defaultdict(list)
for xs in xss:
d[xs[0]].extend(xs[1:])
return list(v for k,v in sorted(d.items()))
y = [[0,'a','b'], [1,'c','d'], [2,'e','f'], [3,'g','h'], [1,'i','j'],
[2,'k','l'], [4,'m','n'], [2,'o','p'], [4,'q','r'], [5,'s','t']]
print collect(y)
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