Confused regarding few columns description in credit card dataset - dataset

Hello folks,
Can anyone be able to explain columns (X6 - X23) meaning in credit card dataset hosted on this link - https://archive.ics.uci.edu/ml/datasets/default+of+credit+card+clients since I've got limited knowledge of credit cards.
Any help would be appreciated, thanks.

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I'm creating a body-wax comparison website for my own project with cakephp4 and I'm stuck with a problem right now and I dunno what to do.
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There are multiple body-waxing companies, each company has many options for waxing like legs, arms,
beard etc. And each company has different price range for each waxing part.
CompanyA->arms = $60
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I already connected to the Companies-table and Parts-table like the image below. Additionally, I came up with the idea of Prices-table too but I'm not sure if it's doable or I need to come up with something else.
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Google Sheets: Automatically entering data into a cell based on the values of two neighbouring cells

First of all, I am a complete novice at spreadsheets, so please explain things to me like I'm five years old. Secondly, I've already searched this throughout the internet but the only help seems to be related to entering data based on the value of one cell, not two.
I'm a language teacher and I'm using a tracker to keep a record of all the lessons that I teach. There are three important values:
The course (Beginner, Elementary, Intermediate, Upper-Intermediate or Advanced). I'm entering this information in column C.
The lesson number (1-20). Each course contains 20 lessons. So, for example, once students complete all 20 lessons in the Beginner course, they move on to the Elementary course. I'm entering this information in column D.
The lesson title. So for example, Beginner lesson 1 is called 'Introduction to English', and Intermediate lesson 15 is called 'Making phone calls'. I'm entering this information in column E.
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you can use VLOOKUP where you join C&D and look that up in your other sheet where you have that table (let's say it's in Sheet1!A:C where C=Sheet1!A, D=Sheet1!B and E=Sheet1!C) then you just use this in row 2:
=INDEX(IFNA(VLOOKUP(C2:C&"×"&D2:D, {Sheet1!A:A&"×"&Sheet1!B:B, Sheet1!C:C}, 2, 0)))
update:
=INDEX(IFNA(VLOOKUP(E2:E, 'UPDATED Lessons'!A2:J,
MATCH(D2:D, 'UPDATED Lessons'!A1:J1, ), )))
#player0 helped me out with the sheet in the end with this very clever formula. Thanks so much!
=INDEX(IFNA(VLOOKUP(E2:E, 'UPDATED Lessons'!A2:J, MATCH(D2:D, 'UPDATED Lessons'!A1:J1, ), )))

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I'm new to Microsoft SQL Server Management Studio and I am stumped on this one homework question. I am trying to get a final total of 3 columns (Upkeep, Staging and Marketing by Housing Type) as a new column on the right (next to Marketing column). Please refer to this link for the image of what I mean.
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Perhaps I'm not understanding the question, but it seems you just need to add the three sums together and then format. Example below.
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I'm using USPS IntlRateV2 API to retrieve shipping rates for international customers.
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Does anyone can come up with a list of all USPS supported countries?
I've tried contacting the USPS but no reply given.
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I found a nice snippet to get the list off USPS website:
https://github.com/tajmorton/extract_usps_countries/blob/master/extract_countries.py
Credit goes to: taj morton

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