.BI gcd( expression ", " expression )
\- greatest common divisor
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.BI has( expression ", " pattern )
\- returns "1" if the first expression contains the pattern as a subexpression, "0" otherwise
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.BI gcd( expression ", " expression )
\- greatest common divisor
.br
.BI has( expression ", " pattern )
\- returns "1" if the first expression contains the pattern as a subexpression, "0" otherwise
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