R: R version 4.6.1 (2026-06-24) 
Platform: x86_64-pc-linux-gnu 
agricolae: 1.3.7 
Residual df: 20 20 
Residual mean square: 1.2 1.2 
Same numeric pair, before and after renaming B <-> D:
      difference pvalue signif.            LCL              UCL
A - B     -1.625 0.0363       * -3.15369694116 -0.0963030588423
      difference pvalue signif.            LCL            UCL
A - D     -1.625 0.0791       . -3.39520265094 0.145202650939
Displayed groups before renaming:
      y groups
D 8.000      a
C 4.000      b
B 1.625      c
A 0.000      d
Displayed groups after renaming:
      y groups
B 8.000      a
C 4.000      b
D 1.625      c
A 0.000      c