Now we are looking on the crossword clue: Kids’ song refrain.
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Possible Answers: EIEIO.
Random information on the term “EIEIO”:
Enforce In-Order Execution of I/O, or EIEIO, is a machine code instruction used on the PowerPC computer processor which prevents one memory or I/O operation from starting until the previous memory or I/O operation completed. This instruction is needed as I/O controllers on the system bus require that accesses follow a particular order, while the CPU reorders accesses to optimize memory bandwidth usage. 
Taken from Wikipedia