>>> [x+y for x in 'ctx' for y in 'CTX']
['cC', 'cT', 'cX', 'tC', 'tT', 'tX', 'xC', 'xT', 'xX']
>>> _=[]
>>> for x in'ctx':
for y in'CTX':
_.append(x+y)
>>> _
['cC', 'cT', 'cX', 'tC', 'tT', 'tX', 'xC', 'xT', 'xX']
>>> [[a,b]for a in range(20) if a%2==0 for b in range(20) if b%4==0]
[[0, 0], [0, 4], [0, 8], [0, 12], [0, 16], [2, 0], [2, 4], [2, 8], [2, 12], [2, 16], [4, 0], [4, 4], [4, 8], [4, 12], [4, 16], [6, 0], [6, 4], [6, 8], [6, 12], [6, 16], [8, 0], [8, 4], [8, 8], [8, 12], [8, 16], [10, 0], [10, 4], [10, 8], [10, 12], [10, 16], [12, 0], [12, 4], [12, 8], [12, 12], [12, 16], [14, 0], [14, 4], [14, 8], [14, 12], [14, 16], [16, 0], [16, 4], [16, 8], [16, 12], [16, 16], [18, 0], [18, 4], [18, 8], [18, 12], [18, 16]]
>>> _=[]
>>> for a in range(20):
if a%2==0:
for b in range(20):
if b%4==0:
_.append([a,b])
>>> _
[[0, 0], [0, 4], [0, 8], [0, 12], [0, 16], [2, 0], [2, 4], [2, 8], [2, 12], [2, 16], [4, 0], [4, 4], [4, 8], [4, 12], [4, 16], [6, 0], [6, 4], [6, 8], [6, 12], [6, 16], [8, 0], [8, 4], [8, 8], [8, 12], [8, 16], [10, 0], [10, 4], [10, 8], [10, 12], [10, 16], [12, 0], [12, 4], [12, 8], [12, 12], [12, 16], [14, 0], [14, 4], [14, 8], [14, 12], [14, 16], [16, 0], [16, 4], [16, 8], [16, 12], [16, 16], [18, 0], [18, 4], [18, 8], [18, 12], [18, 16]]
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