define of hardness 3-4 line thik hai ☺️☺️☺️❤️✌️
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ʜᴀʀᴅɴᴇss ɪs ᴅᴇғɪɴᴇᴅ ᴀs ᴛʜᴇ ʀᴇsɪsᴛᴀɴᴄᴇ ᴏғ ᴀ ᴍᴀᴛᴇʀɪᴀʟ ᴛᴏ ʟᴏᴄᴀʟ ᴘʟᴀsᴛɪᴄ ᴅᴇғᴏʀᴍᴀᴛɪᴏɴ ᴀᴄʜɪᴇᴠᴇᴅ ғʀᴏᴍ ɪɴᴅᴇɴᴛᴀᴛɪᴏɴ ᴏғ ᴀ ᴘʀᴇᴅᴇᴛᴇʀᴍɪɴᴇᴅ ɢᴇᴏᴍᴇᴛʀʏ ɪɴᴅᴇɴᴛᴇʀ ᴏɴᴛᴏ ᴀ ғʟᴀᴛ sᴜʀғᴀᴄᴇ ᴏғ ᴍᴇᴛᴀʟ ᴜɴᴅᴇʀ ᴀ ᴘʀᴇᴅᴇᴛᴇʀᴍɪɴᴇᴅ ʟᴏᴀᴅ.
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