Watermelon version of space problems (Zhou Zhihua watermelon book)

Table 1.1 data set Watermelon

Numbering	Color	Pedicle	Knocking sound	Good melon
1	Green	Curl up	Voiced sound	Yes
2	Pitch-black	Curl up	Voiced sound	Yes
3.	Green	Stiffness	Crisp	no
4.	Pitch-black	Slightly curled	Depressing	no

Version space as follows: 3 * 4 * 4 + 1 = 49

1.	*	*	*	26.	*	Slightly curled	Crisp
2.	Pitch-black	*	*	27.	*	Slightly curled	Depressing
3.	Green	*	*	28	*	Stiffness	Voiced sound
4.	*	Curl up	*	29	*	Stiffness	Crisp
5.	*	Slightly curled	*	30	*	Stiffness	Depressing
6.	*	Stiffness	*	31	Green	Curl up	Voiced sound
7.	*	*	Voiced sound	32	Green	Curl up	Crisp
8.	*	*	Crisp	33	Green	Curl up	Depressing
9.	*	*	Depressing	34	Green	Slightly curled	Voiced sound
10.	Green	Curl up	*	35	Green	Slightly curled	Crisp
11.	Green	Slightly curled	*	36	Green	Slightly curled	Depressing
12.	Green	Stiffness	*	37	Green	Stiffness	Voiced sound
13.	Pitch-black	Curl up	*	38	Green	Stiffness	Crisp
14.	Pitch-black	Slightly curled	*	39	Green	Stiffness	Depressing
15.	Pitch-black	Stiffness	*	40	Pitch-black	Curl up	Voiced sound
16.	Green	*	Voiced sound	41	Pitch-black	Curl up	Crisp
17.	Green	*	Crisp	42	Pitch-black	Curl up	Depressing
18.	Green	*	Depressing	43	Pitch-black	Slightly curled	Voiced sound
19	Pitch-black	*	Voiced sound	44	Pitch-black	Slightly curled	Crisp
20.	Pitch-black	*	Crisp	45	Pitch-black	Slightly curled	Depressing
21.	Pitch-black	*	Depressing	46	Pitch-black	Stiffness	Voiced sound
22.	*	Curl up	Voiced sound	47	Pitch-black	Stiffness	Crisp
23.	*	Curl up	Crisp	48	Pitch-black	Stiffness	Depressing
24.	*	Curl up	Depressing	49	∅
25.	*	Slightly curled	Voiced sound

1. In accordance with and consistent sample 3, deleted    

2. The sample is consistent and 4, delete    

The first property, and examples 1 and 2 have both the same, deleting    

The latter two properties, delete other inconsistencies    

The empty set