Abstract: The methods employ a technique of switching one removable-storage-device (RSD) to the other to give different, data files of answers to homework questions for a computer (401, 501) to grade. The computer uses grading software with a graphical-user-interface (GUI) (201) to electronically compare data in two, different, plain, text files, namely student-files with a reference-file in electrically scoring. The reference-file contains only the data of the right answers to the homework questions. A teacher makes it, gives its file-name to match the one of its receiving-file in the grading software and stores it in an RSD (301, 302). The student-files contain class-related information as student-file-identifications, and the data of the answers believed to be the right answers of the same, homework questions. Students make them and give their file-names to match those of their receiving-files. They comprise the same word with different numbers in the ascending, numerical order as suffixes.

Abstract: The methods employ a technique of switching one removable-storage-device (RSD) to the other to give different, data files of answers to homework questions for a computer (401, 501) to grade. The computer uses grading software with a graphical-user-interface (GUI) (201) to electronically compare data in two, different, plain, text files, namely student-files with a reference-file in electrically scoring. The reference-file contains only the data of the right answers to the homework questions. A teacher makes it, gives its file-name to match the one of its receiving-file in the grading software and stores it in an RSD (301, 302). The student-files contain class-related information as student-file-identifications, and the data of the answers believed to be the right answers of the same, homework questions. Students make them and give their file-names to match those of their receiving-files. They comprise the same word with different numbers in the ascending, numerical order as suffixes.

Abstract: A paint can attachment 10 is for use on all nominal sized paint cans and the like. It is designed to snap-fit on top of a paint can 12 to protect the lid receiving groove 20 of the paint can 12 from paint during painting. The main part of the paint can attachment 10 has the shape of an annular ring 26. Its conical inner wall 38 can receive paint can lids of various sizes. A lid-sized elastic band 52 is used to press the original lid 12 against the conical inner wall 38 to keep the contents in a useable condition. A flexible annular ledge 40 provides for its lower part 42 to sealingly engage the inner peripheral bead 16 of the paint can 12. Due to a predeterminate width of the lower part 42 of the annular ledge 40, this lower part 42 always sits on the top of the inner peripheral bead 16 of the paint can 12, even though there are variations in diameter of the opening of the paint can 12. The paint can attachment 10 also provides a spout 54 which can be used in pouring as well as to rest a paint brush 64.