Splitting of a signal in a proton NMR spectrum tells us the number of chemically non$-$equivalent hydrogens in the immediate vicinity of the hydrogen giving the signal. Predict the number of lines exhibited by hydrogens at the labeled positions in a first$-$order NMR spectrum. $($Make the approximation that all coupling constants are equal.$)$

The number of lines exhibited by hydrogen$($s$)a$ is

The number of lines exhibited by hydrogen$($s$)b$ is

The number of lines exhibited by hydrogen$($s$)c$ is

The number of lines exhibited by hydrogen$($s$)a$ is

The number of lines exhibited by hydrogen$($s$)b$ is

The number of lines exhibited by hydrogen$($s$)c$ is

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