Word Mergefield IF AND failure

I'm trying to create a line of text that only appears when Mergefield A and global B are true or when global C is correct.

I've managed to create the below from help I've found around the internet, but it will still not create the letter correctly with this.

    { IF { = {IF { MERGEFIELD A } = "F" 1 0 } + { IF { MERGEFIELD GLOBAL_B } > 0 1 0 } } =2 "TEXT with mergefield in it" "" \* MERGEFORMAT}

    {IF { MERGEFIELD GLOBAL_C } > 0 "TEXT with mergefield in it" "" \*MERGEFORMAT } 

Can you help?