| 摘要 |
Serious learning disabilities that are encountered by students learning to read, write and spell include the mirror image reversal of letters, the writing of letters upside down and letter reversals in words. Corrections of these disabilities is achieved by providing a correct or standard version of the letter or word symbol, a matching element with the correct version of the letter or word symbol and indicia thereon which indicate proper orientation of the matching element for testing the match of the standard symbol with a series of test symbols aligned along a row, a majority of which are identical to the matching symbol on the matching element. The standard symbol and the test symbols that are used may be printed on a sheet or card and the matching symbol may be printed on a transparent overlay.
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