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The lgs language is 'space sensitive'. If you write
((2,3))
or
( ( 2 , 3 ) )
then lgc will not understand you. The combinations construct has form
(( " , " ))
Thus, you must write
(( 2 , 3 ))
with spaces around 2 and 3 and no spaces between parentheses.
An arbitrary sequence of space and newline characters count as a single space so you can also write
(( 2 ,
3
))
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