Controls and indicators function as variables. In a text based language, you could just write the name of the variable again. In LV, since each control only has one terminal, you need local variables to do this. To create a local variable, right click on the control and from the popup menu select Create>>Local Variable. You can have a local as read or write. Create a local for each of the buttons and wire the data coming out of the first button into the locals.
There is something that is very important to understand here - when you use locals, you can disrupt the dataflow nature of LV and create race conditions. For example - if, after fixing your code, you were to click on one of the buttons, to set it to F, it would immediately be set back to T by the running code. This can be very dangerous. Also, I see you're using the continuous run mode. You should use a loop instead. Try looking for some LV by searching google for "Labview tutorials. Also,
here's one you can start with.
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