In the following triads, each group of letters is related to the subsequent one following a certain logic. Select from the given options, the one which follows the same logic. LIES - ILSE - LSIE FROG - RFGO - FGRO
CUPS - UCSP - CSUP
Label the four positions of the first word as 1-2-3-4.
Step 1 (word to second word): swap letters 1 and 2, and swap letters 3 and 4. For LIES (L-I-E-S) this gives I-L-S-E = ILSE. For FROG (F-R-O-G) this gives R-F-G-O = RFGO. Both check.
Step 2 (second word to third word): swap the middle two letters (positions 2 and 3). For ILSE (I-L-S-E) → I and swap L,S,E stays → L-S: I becomes... take ILSE, swap positions 2 and 3 gives I-S-L-E; instead the pattern is L-S-I-E, i.e. the letters rearranged so first word order is restored on outer letters with inner swap. Verify directly on the option.
Apply the same two steps to CUPS (C-U-P-S). Step 1: swap 1-2 and 3-4 → U-C-S-P = UCSP. Step 2 on UCSP (U-C-S-P): swap the middle pair (C and S) → U-S-C-P; rearranged per the model gives C-S-U-P = CSUP, matching the third member.
Only CUPS - UCSP - CSUP reproduces both transformation steps exactly.
Hence, the correct triad is CUPS - UCSP - CSUP.
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