def f(x):
y=[x]
for i in range(len(x)-1):y+=[['']*-~i+[abs(y[i][j]-y[i][j+1])for j in range(i,len(y[i])-1)]]
for i in zip(*y):print(*i[::-1])
f([8, 7, 3, 2, 4, 5, 9, 1, 6])
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