Below-staff ledger lines and below-staff text (lyrics, dynamics) compete for the same vertical band

Dynamics and lyrics are conventionally placed in the space immediately below the staff — exactly where below-staff ledger lines also live. When a note carrying a below-staff ledger line also carries a dynamic marking or lyric at that same beat, the text must be pushed further down (below the lowest ledger line reached at that beat, plus the ordinary text-to-notation clearance) rather than colliding with or sitting directly on top of the ledger lines.

A dynamic marking (e.g. 'mf') printed at the standard below-staff offset directly on top of two ledger lines belonging to a bass note that dips below the staff at that beat.

This is the ledger-specific instance of `vs-dynamic-notehead-clearance` / `vs-lyric-ledgerline-clearance`, already specified in the Vertical Spacing and Text/Lyrics chapters — cross-reference rather than duplicate. Gould, Behind Bars, Lyrics chapter and Dynamics chapter both note that text placement must clear the LOWEST element in its column, which on a ledgered note means the ledger lines, not the staff's bottom line.

This rule is about where marks land on the page, so it can only be judged after engraving. Collision and spacing faults live here.