Open up a chart, and type in any instrument (like ES 03-10 for example). Set it to be something like 2 minutes in terms of chart length.
Now try typing in 6s 03-10 to change it to the swiss franc contract. It does the change, but it also changes the periodicity to 6 seconds. This is a special case because 6S happens to be the name of a contract and also a time frame specification, so maybe you can make a special bit of code for it.

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