$($b$)$ Describe the transition enabling the firing sequences for the following marking sequence. If there is a

transition can be fired, what is the following marking tuple $($you can show by either drawing on the petri

nets or the expressions$).$

$m_1=(0,0,1,0,0)$

$m_2=(1,0,2,0,0)$

$m_3=(0,0,0,1,0)$

$m_4=(1,0,0,1,0)$

$m_5=(0,0,0,0,1)$

$m_6=(0,1,0,2,1)$

$m_7=(0,0,0,1,0)$