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	4	⊢
2	instantiation	4, 5, 6	⊢
	: , : , :
3	reference	15	⊢
4	theorem		⊢
	proveit.logic.equality.sub_left_side_into
5	instantiation	7, 18, 22, 8, 9	⊢
	: , : , : , : , :
6	instantiation	10, 11, 12	⊢
	: , : , :
7	theorem		⊢
	proveit.logic.sets.enumeration.proper_subset_of_superset
8	instantiation	25	⊢
	: , :
9	instantiation	13, 14, 15	⊢
	: , : , :
10	axiom		⊢
	proveit.logic.equality.equals_transitivity
11	instantiation	20, 21, 22, 16, 23, 17	⊢
	: , : , : , : , : , : , :
12	instantiation	20, 22, 18, 21, 19, 23	⊢
	: , : , : , : , : , : , :
13	theorem		⊢
	proveit.logic.equality.sub_right_side_into
14	assumption		⊢
15	instantiation	20, 21, 22, 23	⊢
	: , : , : , : , : , : , :
16	theorem		⊢
	proveit.numbers.numerals.decimals.nat3
17	instantiation	24	⊢
	: , : , :
18	theorem		⊢
	proveit.numbers.numerals.decimals.nat2
19	instantiation	25	⊢
	: , :
20	theorem		⊢
	proveit.logic.sets.enumeration.reduction_right
21	axiom		⊢
	proveit.numbers.number_sets.natural_numbers.zero_in_nats
22	theorem		⊢
	proveit.numbers.numerals.decimals.nat1
23	theorem		⊢
	proveit.core_expr_types.tuples.tuple_len_0_typical_eq
24	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_3_typical_eq
25	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_2_typical_eq