Removing Introduction section number

[Vyatcheslav Yatskovsky <yatskovsky@gmail.com>]

Hello,

It might be 100 time this question appears on the list, but I cannot 
find the answer.

I need Introduction to have no number, and next section to have number 
1, so on. My current solution gives me number 2, instead.

Please, look what should be done with my code:

\starttext
\setupindenting[yes, big, first]
\setupheads[indentnext=yes]
\setupfloats[indentnext=yes]

\setuphead[section][number=no]
\section{INTRODUCTION} % should have no number

The syllabus on each discipline is a must for successful teaching 
process organization according to the European Credit Transfer System. 
Teachers and students are to be familiarized with it. Grading system is 
an integral part of the syllabus and provides for assessment of 
student’s knowledge and skills during current, module and semester checks.

Grading procedure is performed according to the national grading scale 
and European Credit Transfer System grading scale.

\setuphead[section][number=yes]
\section{REFERENCE NOTES}  % should have number 1

\subsection{Aim of the discipline}  % 1.1

\subsection{Tasks for learning the discipline} % 1.2

\section{DISCIPLINE CONTENT}  % should have number 2

...

\stoptext
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