Symmetry: 90 degree
Size: 168 cells
Theme:
Four Playfair codewords appear in the perimeter rows and columns.
Clues to symmetrically opposite lights are paired,
with encoded forms of some given;
lights in central row and column are Playfair-coded using a fifth codeword.
Highlight the line below this, to reveal the codewords:
Powdering-tubs, Consumptively, Pneumogastric, Salpingectomy, Ambidextrous