In Glicol `seq`, top-level spaces divide the bar while adjacent digits subdivide a step
The seq sequencer interprets whitespace as bar subdivision: tokens separated by spaces produce equally-spaced steps across the bar. Adjacent digits or underscores without spaces subdivide the same step. So seq 60 _ 60 _ is a four-step pattern (note, rest, note, rest) while seq 60_60_ is a one-step pattern subdivided four ways. A misplaced or missing space changes the rhythmic output entirely. The underscore _ is the rest symbol.
Examples
seq 60 _ 60 _ // 4 steps: note, rest, note, rest
seq 60_60_ // 1 step, subdivided 4-ways (very different rhythm)
Assessment
Rewrite seq 60_60_60_60_ as an explicit four-step pattern with equal spacing, and describe the rhythmic difference between the two forms.