Hofstadter Figure-Figure sequences: Difference between revisions

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=={{header|REXX}}==
This REXX example makes use of sparse arrays.
<br>Almost half of the code was for verification of the first thousand numbers in the Figure-Figure sequences.
<lang rexx>/*REXX pgm to calculate & verify the Hofstadter Figure-Figure sequences.*/
parse arg x highV . /*obtain any C.L. specifications.*/