Sub-surface conditions were especially complex and separate ground water tables made mining difficult.

One problem is that balloting rules this year are especially complex, requiring care in marking and mailing ballots.

The process has been made especially complex to discourage anyone.

If the overlay scheme was especially complex, taskbuilding could take a rather long time.

The combination of low-income workers and an especially complex tax form contributes to a large rate of errors in applying for the credit.

Japanese customs and etiquette can be especially complex and demanding.

For especially complex problems, further analysis may be done at universities or by contractors.

In every larger dictionary, the entries for words like back, set , and take are especially complex.

It set a standard for the high-level teaching of mathematical analysis, especially complex analysis.

Dr. Wellens said the usual pay was about $20 to $40 per question, although some especially complex items can fetch up to $100.