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What How much How old How expensive
cost; buying worth; to be bought worth; buying paid; buying
reading; to buy reading; buying read; to buy to read; buying
pay；spend cost；pay spend；pay take；spend
on which which for which that
spent; in cost; on buy; for paid; in
on which for which in which at which
are；was buying were；was buying was；was buying did；bought
read; to buy reading; buying reading; to buy to read; buying
for which for that which off which
need buys need to buy need buying need to buying
pay；spend cost；pay spend；pay take；spend
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