Problems with itemize with several columns

["Xavier B. via ntg-context" <ntg-context@ntg.nl>]

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Hi,

I try to solve this, but I could not. Can you please help me.
I make a math problem sheet. In "Exercici 1.2", I put a itemize with three columns, but the 'c' exercise jumps to second column. I want that a, b, c remains in the first column, d, e, f in the second and g, h, i in the third.

I tried \column command but it's worse.

I attached the source and generated pdf.

My version of context is:
 context --version
mtx-context     | ConTeXt Process Management 1.04
mtx-context     |
mtx-context     | main context file: /usr/share/texmf-dist/tex/context/base/mkiv/context.mkiv
mtx-context     | current version: 2021.03.05 19:11
mtx-context     | main context file: /usr/share/texmf-dist/tex/context/base/mkxl/context.mkxl
mtx-context     | current version: 2021.03.05 19:11


Thanks in advance,

Xavier

PS: Please CCme


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\defineenumeration
  [exercici]
  [alternative=serried, before={\blank[medium]\testpage[1]}, text={Exercici}, stopper={.\space}, width=fit, headstyle=\ss, distance=0.25em, width=fit, headcolor=exercici_color, title=yes, titlestyle=\ss, titledistance=0em, left={\bgroup\bf}, right={\egroup}, after={\blank[big]}, prefix=yes, prefixsegments=section, way=section]

\starttext

\section{Operacions amb fraccions}

\subject{Preguntes}

\startexercici[exercici:operacions-amb-fraccions-1]{suma i resta} Opereu:
\startitemize[a, columns, three]
\item \startformula \frac{2}{7} + \frac{6}{7} - \frac{1}{7} \stopformula
\item \startformula \frac{5}{8} + \frac{9}{8} \stopformula
\item \startformula \frac{1}{4} + 5 - \frac{1}{4} \stopformula
\item \startformula \frac{3}{5} - \frac{2}{5} + \frac{11}{5} \stopformula
\item \startformula \frac{2}{3} + \frac{1}{4} \stopformula
\item \startformula 5 + \frac{4}{5} \stopformula
\item \startformula \frac{2}{3} + \frac{5}{8} - \frac{1}{9} \stopformula
\item \startformula 10 - \frac{1}{6} + \frac{6}{8} \stopformula
\item \startformula \frac{3}{10} + \frac{7}{12} \stopformula
\stopitemize
\stopexercici

\startexercici[exercici:operacions-amb-fraccions-2]{multiplicació i divisió} Opereu:
\startitemize[a, columns, three]
\item \startformula 3 \cdot \frac{5}{3} \stopformula
\item \startformula \frac{3}{4} \cdot \frac{2}{5} \stopformula
\item \startformula \frac{1}{3} \cdot \frac{3}{4} \div \frac{1}{5} \stopformula
%\column
\item \startformula 5 \div \frac{7}{10} \cdot 7 \div \frac{2}{5} \stopformula
\item \startformula \frac{1}{2} \cdot \frac{1}{2} \stopformula
\item \startformula \frac{3}{2} \div \frac{2}{3} \div \frac{5}{4} \stopformula
%\column
\item \startformula \frac{2}{3} \colon \frac{2}{5} \stopformula
\item \startformula \frac{3}{4} \colon \frac{1}{2} \cdot 6 \stopformula
\item \startformula \frac{2}{3} \colon \frac{3}{4} \cdot \frac{1}{2} \stopformula
\stopitemize
\stopexercici

\startexercici[exercici:operacions-amb-fraccions-3]{operacions combinades}
\startitemize[a, columns, three]
\item \startformula \frac{3}{4} + \frac{2}{5} \cdot \frac{1}{2} \stopformula
\item \startformula \frac{2}{5} \div \frac{3}{5} - \frac{1}{4} \stopformula
\item \startformula \left( 2 + \frac{3}{5} \right) \div \frac{4}{3} \stopformula
\item \startformula \frac{2}{3} - \frac{5}{6}\cdot 8 \stopformula
\item \startformula 4 + \frac{3}{5} - \left(2 - \frac{1}{2}\right) \stopformula
\item \startformula 4 \cdot \left(\frac{5}{6} - \frac{1}{4} + \frac{4}{9}\right) \stopformula
\item \startformula \frac{5}{6} - \left(\frac{1}{5} + \frac{1}{3}\right) \stopformula
\item \startformula \frac{5}{6} \div \left( \frac{2}{5} - \frac{1}{10}\right) \stopformula
\item \startformula 4 \cdot \frac{2}{3} \cdot \left(\frac{2}{4} \div \frac{8}{10}\right) \stopformula
\item \startformula \frac{3}{4} + \frac{1}{2} \cdot \frac{4}{10} \stopformula
\item \startformula \frac{10}{12} - \left(\frac{1}{10} + \frac{3}{8}\right) \stopformula
\item \startformula \left(\frac{1}{2} + 2\right) \cdot \left(2 - \frac{1}{4}\right) \stopformula
\item \startformula \left(\frac{3}{4} + \frac{1}{4}\right) \div \left(\frac{5}{6} - \frac{1}{3}\right) \stopformula
\item \startformula 5 + 10 - \frac{1}{10} + 25 \stopformula
\item \startformula \frac{1}{3} + \frac{1}{2} - \frac{2}{5} \stopformula
\item \startformula \left(\frac{1}{2} + \frac{2}{10}\right) \cdot \frac{2}{6} \stopformula
\item \startformula 5 + \frac{1}{3} \cdot \frac{5}{3} \stopformula
\item \startformula \left( 5 + \frac{1}{3} \right) \cdot \frac{5}{3} \stopformula
\stopitemize
\stopexercici

\stoptext

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