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The contralto singing voice has a vocal range that lies between the F below "middle C" (F 3) to two Fs above middle C (F 5) and is the lowest type of female voice.In the lower and upper extremes, some contralto voices can sing from two Bs below middle C (B 2) to two B ♭ s above middle C (B ♭ 5).
Many biofeedback systems treat disorders such as attention deficit hyperactivity disorder (ADHD), sleep problems in children, teeth grinding, and chronic pain. EEG biofeedback systems typically monitor four brainwave bands (theta: 4–7 Hz, alpha:8–12 Hz, SMR: 12–15 Hz, beta: 15–18 Hz) and challenge the subject to control them.
Recoiling from the pain, Toothy loses his balance and falls off the tree, which is revealed to have been located on the edge of a cliff, causing Toothy to dangle from the branch of a tree off a cliff from only his optic nerve (which acts as a bungee cord). Toothy tries climbing back up his optic nerve, but he loses his grip and slides down again.