reworking latex skip condition

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extra : source : d26296b818d390a1ce1d5b36332cce6ced878bc8
reworking latex skip condition, now must be manually triggered

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extra : source : 9bb1da7b2a3e4a8c185c2b3134990500c25cc639
Fixing braindead syntax error in test cases

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extra : source : f25ba8f786264691b62c2886c96dc995d5bf4efc