11.   The ultrasound exam would increase the cost of the tests.

12.   Then an ultrasound exam discovered the strain.

n. + exam >>共 173
entrance 21.26%
college 7.66%
eye 5.44%
university 2.84%
polygraph 2.47%
school 2.10%
exit 2.10%
graduation 1.85%
certification 1.73%
citizenship 1.61%
ultrasound 1.48%
ultrasound + n. >>共 61
test 12.90%
examination 9.03%
machine 9.03%
scan 9.03%
equipment 5.16%
image 4.19%
treatment 4.19%
exam 3.87%
device 3.23%
wave 2.90%
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