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DS-1000 / 481 / I have two numpy arrays x and y

Problem

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Problem:
I have two numpy arrays x and y
Suppose x = [0, 1, 1, 1, 3, 1, 5, 5, 5] and y = [0, 2, 3, 4, 2, 4, 3, 4, 5]
The length of both arrays is the same and the coordinate pair I am looking for definitely exists in the array.
How can I find indices of (a, b) in these arrays, where a is an element in x and b is the corresponding element in y.I want to take an increasing array of such indices(integers) that satisfy the requirement, and an empty array if there is no such index. For example, the indices of (1, 4) would be [3, 5]: the elements at index 3(and 5) of x and y are 1 and 4 respectively.
A:
<code>
import numpy as np
x = np.array([0, 1, 1, 1, 3, 1, 5, 5, 5])
y = np.array([0, 2, 3, 4, 2, 4, 3, 4, 5])
a = 1
b = 4
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
481
task_id
a3d1504b-db4f-5420-b7d7-4e018a9fab07
task_key
default--test--481
task_revision_id
1
config / split
default / test

Official source

initial import