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# BEGIN DIALCODES

# dial codes of the top 10 most populous countries

DIAL_CODES = [

(86, 'China'),

(91, 'India'),

(1, 'United States'),

(62, 'Indonesia'),

(55, 'Brazil'),

(92, 'Pakistan'),

(880, 'Bangladesh'),

(234, 'Nigeria'),

(7, 'Russia'),

(81, 'Japan'),

]

d1 = dict(DIAL_CODES) # <1>

print('d1:', d1.keys())

d2 = dict(sorted(DIAL_CODES)) # <2>

print('d2:', d2.keys())

d3 = dict(sorted(DIAL_CODES, key=lambda x:x[1])) # <3>

print('d3:', d3.keys())

assert d1 == d2 and d2 == d3 # <4>

# END DIALCODES

"""

# BEGIN DIALCODES_OUTPUT

d1: dict_keys([880, 1, 86, 55, 7, 234, 91, 92, 62, 81])

d2: dict_keys([880, 1, 91, 86, 81, 55, 234, 7, 92, 62])

d3: dict_keys([880, 81, 1, 86, 55, 7, 234, 91, 92, 62])

# END DIALCODES_OUTPUT

"""