31.   Some observers trace his shrewdness to an unhappy childhood.

a. + childhood >>共 345
early 28.64%
happy 3.98%
unhappy 3.01%
difficult 2.33%
normal 2.33%
common 2.23%
troubled 2.04%
earliest 1.36%
idyllic 0.87%
abusive 0.78%
unhappy + n. >>共 399
marriage 4.39%
childhood 3.16%
ending 3.16%
people 2.86%
customer 2.04%
experience 1.94%
man 1.84%
camper 1.53%
player 1.53%
time 1.53%
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