$calculator (mod m)$

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$^{b} a$	$_{a} P_{b}$	$a^{- 1}$	$a!$	$a^{b}$	$\div$
`todo!()`	$_{a} C_{b}$	$7$	$8$	$9$	$\times$
`todo!()`	$a$	$4$	$5$	$6$	$-$
`todo!()`	$dlog_{a} (b)$	$1$	$2$	$3$	$+$
`todo!()`	$A (a, b)$	$0$	$\equiv$		C