Write missing symbols, denoted by \(x,\) in the following nuclear reactions: (a) \(\mathrm{B}^{10}(x, \alpha) \mathrm{Be}^{8}\) (b) \(\mathrm{O}^{17}(d, n) x\) (c) \(\mathrm{Na}^{23}(p, x) \mathrm{Ne}^{20}\) (d) \(x(p, n) \mathrm{Ar}^{37}\).