Show the Proof

import proveit
# Automation is not needed when only showing a stored proof:
proveit.defaults.automation = False # This will speed things up.
proveit.defaults.inline_pngs = False # Makes files smaller.
%show_proof

	step type	requirements	statement
0	instantiation	1, 2, 3	⊢
	: , :
1	reference	6	⊢
2	generalization	4	⊢
3	instantiation	5	⊢
	: , :
4	instantiation	6, 7, 8	,  ⊢
	: , :
5	axiom		⊢
	proveit.logic.sets.inclusion.subset_eq_def
6	theorem		⊢
	proveit.logic.equality.lhs_via_equality
7	instantiation	9, 10, 11, 16	,  ⊢
	: , :
8	instantiation	12, 13, 14	⊢
	: , : , :
9	theorem		⊢
	proveit.logic.booleans.disjunction.or_if_left
10	instantiation	15, 16	⊢
	:
11	instantiation	17	⊢
	:
12	axiom		⊢
	proveit.logic.sets.unification.union_def
13	theorem		⊢
	proveit.numbers.numerals.decimals.posnat2
14	instantiation	18	⊢
	: , :
15	theorem		⊢
	proveit.logic.booleans.in_bool_if_true
16	assumption		⊢
17	assumption		⊢
18	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_2_typical_eq