$5.$Let x be a real number with $0<x<1$ and let $0.c_1c_2c_3...$ be the decimal expansion of x.Denote by $B(x)$ the set of all subsequences of $c_1c_2c_3$ that consist of 6 consecutive digits.
For instance , $B(\frac{1}{22})={045454,454545,545454}$
Find the minimum number of elements of $B(x)$ as $x$ varies among all irrational numbers with $0<x<1$

1. **Claim the answer is 7**: We start by claiming that the minimum number of elements in \( B(x) \) for any irrational number \( x \) in the interval \( 0 < x < 1 \) is 7.

2. **Construct an example**: Consider the number \( a = 0.100000100000010000000\ldots \), where there are \( 5, 6, 7, \ldots \) zeroes separating consecutive ones. We need to show that \( a \) is irrational and that \( B(a) \) has exactly 7 elements.

3. **Prove \( a \) is irrational**: Suppose \( a \) is rational. Then \( a \) would eventually become periodic after some \( k \)-th digit. Let the repeated part contain \( l \) digits. Since there are infinitely many sequences of more than \( 2l \) consecutive zeroes, at least one such sequence must occur after the \( k \)-th digit. This implies that the repeated part must contain \( l \) zeroes, but there are also infinitely many ones, leading to a contradiction. Hence, \( a \) is irrational.

4. **Determine \( B(a) \)**: The set \( B(a) \) consists of all subsequences of 6 consecutive digits in the decimal expansion of \( a \). These subsequences are:
   \[
   B(a) = \{000000, 000001, 000010, 000100, 001000, 010000, 100000\}
   \]
   This set has exactly 7 elements.

5. **Upper bound of 7**: Since we have constructed an irrational number \( a \) with \( |B(a)| = 7 \), the minimum number of elements in \( B(x) \) for any irrational \( x \) must be at most 7.

6. **Prove \( |B(x)| \leq 6 \) implies \( x \) is rational**: We now show that if \( |B(x)| \leq 6 \), then \( x \) must be rational. Let \( B_k(x) \) be the set of all subsequences of the decimal expansion of \( x \) with \( k \) digits. We claim that if \( |B_k(x)| \leq k \), then \( x \) must be rational. We will prove this by induction on \( k \).

   - **Base case \( k = 1 \)**: If \( |B_1(x)| = 1 \), then \( x \) must be of the form \( 0.yyy\ldots = \frac{y}{9} \) for some digit \( y \), which is rational.
   
   - **Inductive step**: Assume the statement holds for \( k \). We need to show it holds for \( k + 1 \). If \( |B_{k+1}(x)| \leq k + 1 \), then \( |B_k(x)| \leq |B_{k+1}(x)| \leq k + 1 \). If \( |B_k(x)| \leq k \), then \( x \) is rational by the induction hypothesis. If \( |B_k(x)| = |B_{k+1}(x)| = k + 1 \), then each \( k \)-digit sequence uniquely determines the next digit, leading to periodicity and thus rationality of \( x \).

7. **Conclusion**: Since \( x \) is irrational, \( |B(x)| \geq 7 \). Therefore, the minimum number of elements in \( B(x) \) for any irrational \( x \) is \( \boxed{7} \).