Comments about #12421

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SylT: Enjoyed it. Thanks. (9 months, 3 weeks ago)

h: why not hospital drama? (1 year, 2 months ago)

AJ: As others have said, needs to be square root of -1. Otherwise great quiz. (1 year, 2 months ago)

Frantic: Was marked wrong for 24 for some reason. Good variety. (1 year, 2 months ago)

Colm: -1 is not i; liked the last group - kicking myself that I missed it (1 year, 2 months ago)

Nick H: unfortunately, the number -1 is NOT known as/abbreviated to 'i'. i is the SQUARE ROOT of -1, hence an 'impossible number', (i for impossible!). Other than that, nice grid (1 year, 2 months ago)

Nellington: Very enjoyable grid. Nice work! (1 year, 2 months ago)