+--------------------------------------------------+ | | | _______ | | left / \ right | | +------------|initial|-----------------+ | | | \_______/ | | | | | | | | +--------+ | | | ___V___ | | | | |left / \ right | _V__V_V_ +-----| red |--------------+ | left / \ right \_______/ | +------| blue |------+ ^ | \________/ | | | | | | | | __V____ | | left / \ right | | +-----| end |------+ | | | \_______/ | | | | ^ ^ | | | | | | | | | +-------+ +---------+ | | | +-------------------------------------------------+