A quicker way to place W is to work with alphabet positions directly instead of writing out every block of letters.
Assign positions: number the alphabet from A = 1 to Z = 26. W is the 23rd letter.
Set up the repeating cycle: after the single letter A, the rest of the alphabet, positions 2 to 26, splits into blocks of 4 that alternate above and below the line, starting with "above" for B, C, D, E.
Locate W within the cycle: subtract 2 from W's position to measure its distance from B: $23 - 2 = 21$. Dividing by 4 gives $21 \div 4 = 5$ remainder $1$, so W sits in block number 5, counting the BCDE block as block 0.
Check whether that block is above or below: block 0 (BCDE) is above, block 1 (FGHI) is below, block 2 (JKLM) is above, block 3 (NOPQ) is below, block 4 (RSTU) is above, block 5 (VWXY) is below.
Block 5 is odd in this counting, so it sits below the line, and W falls inside block 5, the group V, W, X, Y.
Let's summarize:
W is the 23rd letter of the alphabet, landing in the VWXY group.
Counting blocks of 4 from B, the VWXY group is an odd-numbered block, which the pattern places below the line.
W therefore belongs below the line, confirming the same answer reached by listing out the blocks directly.
