this also, helicopter (worksheet 2-1)
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ᴛʜᴇ sᴄɪᴇɴᴄᴇ ᴛʜᴀᴛ ᴅᴇᴀʟs ᴡɪᴛʜ ᴛʜᴇ ᴄᴏᴍᴘᴏsɪᴛɪᴏɴ ᴀɴᴅ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴏғ sᴜʙsᴛᴀɴᴄᴇs ᴀɴᴅ ᴠᴀʀɪᴏᴜs ᴇʟᴇᴍᴇɴᴛᴀʀʏ ғᴏʀᴍs ᴏғ ᴍᴀᴛᴛᴇʀ
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