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\def\cals@spanq@heights{{0pt}} \def\cals@lastWidth{0pt} \brow \nullcell{lr} \show\cals@span@ifL \show\cals@span@ifT \show\cals@span@ifR \show\cals@span@ifB \def\cals@lastWidth{0pt} \nullcell{tb} \show\cals@span@ifL \show\cals@span@ifT \show\cals@span@ifR \show\cals@span@ifB