The goal of the investigation is to excavate and present evidence, incriminatory or exculpatory, directly relevant to the complaint issued when the case was first handed over.
The rational root theorem states that if the rational number p/q is a root of the polynomial equation a_nxⁿ+a_n-1xⁿ⁻¹+⋯+a_0=0, with a_0,…a_n∈ℤ, then p|a_0 and q|a_n.
So if your next note involves lifting a finger, you need to plan to lift the finger promptly to above its spot on the string so that it's ready to play again at any time.
Because of this isolation, and the lack of visitor 'attractions' deemed plug-worthy, nobody goes to Gabalfa unless they live there, work there, or are writing a painstaking Cardiff history.