Dictionary.com

As a side note, this is not true in Python 3, as .keys() is just a light view over the dictionary keys.

$ python -m timeit -s "a = {i+1: i for i in range(5000000)}" "1 in a"
10000000 loops, best of 3: 0.0313 usec per loop

$ python -m timeit -s "a = {i+1: i for i in range(5000000)}" "0 in a"
10000000 loops, best of 3: 0.0308 usec per loop

$ python -m timeit -s "a = {i+1: i for i in range(5000000)}; keys = a.keys()" "1 in keys"
10000000 loops, best of 3: 0.0304 usec per loop

$ python -m timeit -s "a = {i+1: i for i in range(5000000)}; keys = a.keys()" "0 in keys"
10000000 loops, best of 3: 0.0303 usec per loop

$ python -m timeit -s "a = {i+1: i for i in range(5000000)}; keys = list(a.keys())" "1 in keys"
10000000 loops, best of 3: 0.0259 usec per loop

$ python -m timeit -s "a = {i+1: i for i in range(5000000)}; keys = list(a.keys())" "0 in keys"
10 loops, best of 3: 62.4 msec per loop

Alright I ended up finding it by searching all over the net LOL took me 2 hours but I did itThe website is https://www.tanoshiijapanese.com if anyone is interested (:

You can type the word in the Notes app, but other than that, I don't know.