Table 4. Event types, parameter values and corresponding physical meanings for the preliminary agent-based symmetric random walk model.

Event types	Parameters values	Physical meanings
Decrease of $\mathcal{A}$	$D_A=1$	parameter determining rate of Type (XIII) clocks
	θ− = 0.2	percentage of decay
Spread of $\mathcal{A}$	${\Lambda }_A=20$	parameter determining rate of Type (XIV) clock
	η3 = 0.125	magnitude of spread
Increase of $\mathcal{A}$	${\theta }_r^{+}=0.2$	increment size due to hospitalization events
	${\theta }_a^{+}=1$ , 3, 10, 20	increment size due to symptomatic cases
	$I_A=1$	parameter determining rate of Type (XV) clock