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test of col - true if the col (data location) contains:

col / code                the given code

col / mask                one or more codes in the mask

col / code 1..code2        one or more codes in the range given (inclusive)

col / literal                the code equivalent of the literal which must be one character only (exact match)

col / B                        blank/empty (no codes)

col / S                        one (and only one) code

col / M                        more than one code

col / Cn                exactly n codes. N must be in the range 0 - 12

Examples of simple tests on cols:

$104/v,

$1120/vx9,

$121/1..9,

$123/'K',

$124/b,

$9980/c2,

$88/'a',