11.   Xerox also consolidated many back-office operations last year, causing backlogs in accounts receivables and billing problems.

12.   Under the agreement, HealthSouth also agreed to help prevent future cost reporting and billing problems.

v. + problem >>共 361
have 22.63%
solve 9.06%
cause 5.52%
face 3.36%
address 2.77%
create 2.61%
pose 2.36%
fix 2.32%
resolve 2.12%
discuss 1.64%
bill 0.04%
bill + n. >>共 261
customer 5.48%
record 4.72%
service 2.74%
system 2.74%
company 2.28%
client 2.28%
practice 2.28%
event 2.13%
error 1.98%
problem 1.83%
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